R/methods.R

In fwildclusterboot: Fast Wild Cluster Bootstrap Inference for Linear Models

#' Fast wild cluster bootstrap inference
#'
#'
#' `boottest` is a S3 method that allows for fast wild cluster
#' bootstrap inference for objects of class lm, fixest and felm by  implementing
#' the fast wild bootstrap algorithm developed in Roodman et al., 2019.
#'
#' @param object An object of type lm, fixest, felm or ivreg
#' @param ... other arguments
#'
#' @seealso [boottest.lm][fwildclusterboot::boottest.lm],
#' [boottest.fixest][fwildclusterboot::boottest.fixest],
#' [boottest.felm][fwildclusterboot::boottest.felm],
#'  [boottest.ivreg][fwildclusterboot::boottest.ivreg]
#'
#' @examples
#' requireNamespace("fwildclusterboot")
#' data(voters)
#' lm_fit <- lm(
#'   proposition_vote ~ treatment + ideology1 + log_income + Q1_immigration,
#'   data = voters
#' )
#' boot <- boottest(lm_fit,
#'   B = 9999,
#'   param = "treatment",
#'   clustid = "group_id1"
#' )
#' summary(boot)
#' print(boot)
#' plot(boot)
#' nobs(boot)
#' pval(boot)
#' confint(boot)
#' generics::tidy(boot)
#'
#' @export
#'
#' @section Setting Seeds:
#' To guarantee reproducibility, you can either use `boottest()'s` `seed`
#' function argument, or
#' set a global random seed via
#' + `set.seed()` when using
#'    1) the lean algorithm (via `engine = "R-lean"`), 2) the heteroskedastic
#'     wild bootstrap
#'    3) the wild cluster bootstrap via `engine = "R"` with Mammen weights
#'     or 4) `engine = "WildBootTests.jl"`
#' + `dqrng::dqset.seed()` when using `engine = "R"` for Rademacher, Webb
#' or Normal weights
#'
#' @return An object of class `boottest`.
#' 
#' @section Stata, Julia and Python Implementations:
#' The fast wild cluster bootstrap algorithms are further implemented in the 
#' following software packages: 
#' \itemize{
#' \item Stata:[boottest](https://github.com/droodman/boottest) 
#' \item Julia:[WildBootTests.jl](https://github.com/droodman/WildBootTests.jl) 
#' \item Python:[wildboottest](https://github.com/s3alfisc/wildboottest) 
#' }
#' 
#' @references Roodman et al., 2019, "Fast and wild: Bootstrap inference in
#' STATA using boottest", The STATA Journal.
#' (<https://ideas.repec.org/p/qed/wpaper/1406.html>)
#' @references MacKinnon, James G., Morten Ørregaard Nielsen, and 
#' Matthew D. Webb. Fast and reliable jackknife and bootstrap
#'  methods for cluster-robust inference. No. 1485. 2022. 
#' @references Cameron, A. Colin, Jonah B. Gelbach, and Douglas L. Miller.
#'  "Bootstrap-based improvements for inference with clustered errors."
#'  The Review of Economics and Statistics 90.3 (2008): 414-427.
#' @references Cameron, A.Colin & Douglas L. Miller.
#' "A practitioner's guide to cluster-robust inference"
#' Journal of Human Resources (2015) \doi{doi:10.3368/jhr.50.2.317}
#' @references Davidson & MacKinnon. "Wild Bootstrap Tests for IV regression"
#' Journal of Economics and Business Statistics (2010)
#' \doi{https://doi.org/10.1198/jbes.2009.07221}
#' @references MacKinnon, James G., and Matthew D. Webb.
#' "The wild bootstrap for few (treated) clusters."
#'  The Econometrics Journal 21.2 (2018): 114-135.
#' @references MacKinnon, James G., and Matthew D. Webb.
#' "Cluster-robust inference: A guide to empirical practice"
#'  Journal of Econometrics (2022)
#'  \doi{https://doi.org/10.1016/j.jeconom.2022.04.001}
#' @references MacKinnon, James. "Wild cluster bootstrap confidence intervals."
#'  L'Actualite economique 91.1-2 (2015): 11-33.
#' @references Webb, Matthew D.
#' "Reworking wild bootstrap based inference for clustered errors"
#' . No. 1315. Queen's Economics Department Working Paper, 2013.

boottest <- function(object,
                     ...) {
  
  rlang::warn(
    message = "
    Please note that the seeding behavior for random number
    generation for `boottest()` has changed with `fwildclusterboot` 
    version 0.13. 
    
    It will no longer be possible to 
    exactly reproduce results produced by versions lower than 0.13. 
    
    If your prior results were produced under sufficiently many bootstrap 
    iterations, none of your conclusions will change. 
    For more details about this change, please read the notes in
    [news.md](https://cran.r-project.org/web/packages/fwildclusterboot/news/news.html).", 
    .frequency = "once", 
    .frequency_id = "random-seed-message", 
    use_cli_format = TRUE
  )
  
  UseMethod("boottest")
}


#' Arbitrary Linear Hypothesis Testing for Regression Models via Wald-Tests
#'
#'
#' `mboottest` is a S3 method that allows for arbitrary linear
#' hypothesis testing
#' for objects of class lm, fixest, felm
#'
#' @param object An object of type lm, fixest or felm
#' @param ... other arguments
#'
#' @seealso [mboottest.lm][fwildclusterboot::mboottest.lm]
#'  [mboottest.felm][fwildclusterboot::mboottest.felm]
#'  [mboottest.fixest][fwildclusterboot::mboottest.fixest]
#'
#' @export
#'
#' @section Setting Seeds:
#' To guarantee reproducibility, you can either use `boottest()'s` `seed`
#'  function argument, or
#' set a global random seed via
#' + `set.seed()` when using
#'    1) the lean algorithm (via `engine = "R-lean"`),
#'    2) the heteroskedastic wild bootstrap
#'    3) the wild cluster bootstrap via `engine = "R"` with Mammen weights or
#'    4) `engine = "WildBootTests.jl"`
#' + `dqrng::dqset.seed()` when using `engine = "R"` for Rademacher,
#'  Webb or Normal weights
#'
#' @return An object of class `mboottest`.
#' @references Roodman et al., 2019, "Fast and wild: Bootstrap inference in
#' STATA using boottest", The STATA Journal.
#' (<https://ideas.repec.org/p/qed/wpaper/1406.html>)
#' @references Cameron, A. Colin, Jonah B. Gelbach, and Douglas L. Miller.
#'  "Bootstrap-based improvements for inference with clustered errors."
#'  The Review of Economics and Statistics 90.3 (2008): 414-427.
#' @references Cameron, A.Colin & Douglas L. Miller.
#' "A practitioner's guide to cluster-robust inference"
#' Journal of Human Resources (2015) \doi{doi:10.3368/jhr.50.2.317}
#' @references Davidson & MacKinnon. "Wild Bootstrap Tests for IV regression"
#' Journal of Economics and Business Statistics (2010)
#' \doi{https://doi.org/10.1198/jbes.2009.07221}
#' @references MacKinnon, James G., and Matthew D. Webb.
#' "The wild bootstrap for few (treated) clusters."
#'  The Econometrics Journal 21.2 (2018): 114-135.
#' @references MacKinnon, James G., and Matthew D. Webb.
#' "Cluster-robust inference: A guide to empirical practice"
#'  Journal of Econometrics (2022)
#'  \doi{https://doi.org/10.1016/j.jeconom.2022.04.001}
#' @references MacKinnon, James. "Wild cluster bootstrap confidence intervals."
#'  L'Actualite economique 91.1-2 (2015): 11-33.
#' @references Webb, Matthew D.
#' "Reworking wild bootstrap based inference for clustered errors"
#' . No. 1315. Queen's Economics Department Working Paper, 2013.
#' @examples
#' \dontrun{
#' requireNamespace("clubSandwich")
#' R <- clubSandwich::constrain_zero(2:3, coef(lm_fit))
#' wboottest <-
#'   mboottest(
#'     object = lm_fit,
#'     clustid = "group_id1",
#'     B = 999,
#'     R = R
#'   )
#' summary(wboottest)
#' print(wboottest)
#' nobs(wboottest)
#' pval(wboottest)
#' generics::tidy(wboottest)
#' }
#'
mboottest <- function(object,
                      ...) {
  UseMethod("mboottest")
}

#' `pval` is a S3 method to collect pvalues for objects
#' of type `boottest` and `mboottest`
#'
#' @param object An object of type lm, fixest, felm or ivreg
#' @param ... other arguments
#'
#' @export
#' 
#' @examples
#' requireNamespace("fwildclusterboot")
#' data(voters)
#' lm_fit <- lm(
#' proposition_vote ~ treatment + ideology1 + log_income + Q1_immigration,
#'   data = voters
#' )
#' boot <- boottest(lm_fit,
#'   B = 9999,
#'   param = "treatment",
#'   clustid = "group_id1"
#' )
#' pval(boot)
#' @return 
#' A scalar with the bootstrapped p-value. 




pval <- function(object,
                 ...) {
  UseMethod("pval")
}

#' `teststat` is a S3 method to collect teststats for objects
#' of type `boottest` and `mboottest`
#'
#' @param object An object of type lm, fixest, felm or ivreg
#' @param ... other arguments
#'
#' @export
#' @examples
#' requireNamespace("fwildclusterboot")
#' data(voters)
#' lm_fit <- lm(
#'   proposition_vote ~ treatment + ideology1 + log_income + Q1_immigration,
#'   data = voters
#' )
#' boot <- boottest(lm_fit,
#'   B = 9999,
#'   param = "treatment",
#'   clustid = "group_id1"
#' )
#' teststat(boot)
#' @return A scalar with containing the non-bootstrapped
#' test statistic of interest

teststat <- function(object,
                     ...) {
  UseMethod("teststat")
}

#' S3 method to obtain wild cluster bootstrapped confidence intervals
#' @param object object of type boottest
#' @param ... Further arguments passed to or from other methods.
#' @export
#' @method confint boottest
#' @return A vector containing the boundaries of the wild cluster
#'  bootstrapped confidence interval
#' @examples
#' requireNamespace("fwildclusterboot")
#' data(voters)
#' lm_fit <- lm(
#'   proposition_vote ~ treatment + ideology1 + log_income + Q1_immigration,
#'   data = voters
#' )
#' boot <- boottest(lm_fit,
#'   B = 9999,
#'   param = "treatment",
#'   clustid = "group_id1"
#' )
#' teststat(boot)
#'
confint.boottest <- function(object, ...) {
  stopifnot(inherits(object, "boottest"))

  object$conf_int
}

#' S3 method to obtain the wild cluster bootstrapped p-value of an object
#' of type boottest
#' @param object object of type boottest
#' @param ... Further arguments passed to or from other methods.
#' @export
#' @method pval boottest
#' @return A vector containing the boundaries of the wild cluster
#'  bootstrapped p-value
#' @examples
#' #' requireNamespace("fwildclusterboot")
#' data(voters)
#' lm_fit <- lm(
#'   proposition_vote ~ treatment + ideology1 + log_income + Q1_immigration,
#'   data = voters
#' )
#' boot <- boottest(lm_fit,
#'   B = 9999,
#'   param = "treatment",
#'   clustid = "group_id1"
#' )
#' confint(boot)
#'

pval.boottest <- function(object, ...) {
  stopifnot(inherits(object, "boottest"))

  object$p_val
}

#' S3 method to obtain the non-bootstrapped t-statistic calculated
#' via `boottest()`
#' @param object An object of type boottest
#' @param ... Further arguments passed to or from other methods.
#' @export
#' @method teststat boottest
#' @return A vector containing the non-bootstrapped t-statistic
#'  calculated in `boottest()`
#' @examples
#' requireNamespace("fwildclusterboot")
#' data(voters)
#' lm_fit <- lm(
#'   proposition_vote ~ treatment + ideology1 + log_income + Q1_immigration,
#'   data = voters
#' )
#' boot <- boottest(lm_fit,
#'   B = 9999,
#'   param = "treatment",
#'   clustid = "group_id1"
#' )
#' teststat(boot)
#'
teststat.boottest <- function(object, ...) {
  stopifnot(inherits(object, "boottest"))

  object$t_stat
}


#' S3 method to obtain the effective number of observation used in `boottest()`
#' @param object object of type boottest
#' @param ... Further arguments passed to or from other methods.
#' @export
#' @method nobs boottest
#' @return A scalar containing the effective number of observations
#'  used in `boottest()`
#' @examples
#' requireNamespace("fwildclusterboot")
#' data(voters)
#' lm_fit <- lm(
#' proposition_vote ~ treatment + ideology1 + log_income + Q1_immigration,
#'   data = voters
#' )
#' boot <- boottest(lm_fit,
#'   B = 9999,
#'   param = "treatment",
#'   clustid = "group_id1"
#' )
#' nobs(boot)

nobs.boottest <- function(object, ...) {
  stopifnot(inherits(object, "boottest"))

  object$N
}

tidy.boottest <- function(x, ...) {
  #' S3 method to summarize objects of class boottest into tidy data.frame
  #' @param x object of type boottest
  #' @param ... Further arguments passed to or from other methods.
  #' @importFrom generics tidy
  #' @export
  #' @method tidy boottest
  #' @rdname tidy.boottest
  #' @return A tidy data.frame with estimation results for objects of type
  #'         boottest
  #' @examples
  #' requireNamespace("fwildclusterboot")
  #' data(voters)
  #' lm_fit <- lm(
  #' proposition_vote ~ treatment + ideology1 + log_income + Q1_immigration,
  #'   data = voters
  #' )
  #' boot <- boottest(lm_fit,
  #'   B = 9999,
  #'   param = "treatment",
  #'   clustid = "group_id1"
  #' )
  #' generics::tidy(boot)

  stopifnot(inherits(x, "boottest"))
  # dreamerr::validate_dots(stop = TRUE)

  if (x$engine == "WildBootTests.jl") {
    R <- x$R[which(x$R != 0)]
    hypothesis <-
      paste(paste0(paste0(R, "*"), x$param, collapse = "+"), "=", x$r)
  } else {
    hypothesis <-
      paste(
        paste0(
          paste0(
            x$R, "*"
          ),
          x$param,
          collapse = "+"
        ),
        "=", x$r
      )
  }

  term <- hypothesis
  estimate <- x$point_estimate
  statistic <- x$t_stat
  p.value <- x$p_val
  # std.error <- NA
  if (!is.null(x$conf_int)) {
    conf.low <- x$conf_int[1]
    conf.high <- x$conf_int[2]
  } else {
    conf.low <- conf.high <- NA
  }

  res <-
    data.frame(term, estimate, statistic, p.value, conf.low, conf.high)

  return(res)
}

summary.boottest <- function(object, digits = 3, ...) {
  #' S3 method to summarize objects of class boottest
  #' @param object object of type boottest
  #' @param digits rounding of output. 3 by default
  #' @param ... Further arguments passed to or from other methods.
  #' @method summary boottest
  #' @export
  #' @return Returns result summaries for objects of type boottest
  #' @examples
  #' requireNamespace("fwildclusterboot")
  #' data(voters)
  #' lm_fit <- lm(
  #' proposition_vote ~ treatment + ideology1 + log_income + Q1_immigration,
  #'   data = voters
  #' )
  #' boot <- boottest(lm_fit,
  #'   B = 9999,
  #'   param = "treatment",
  #'   clustid = "group_id1"
  #' )
  #' summary(boot)

  stopifnot(inherits(object, "boottest"))
  dreamerr::validate_dots(stop = TRUE)

  N <- object$N
  B <- object$B
  sign_level <- object$sign_level
  signif_level <- paste0((1 - sign_level) * 100, "%")
  call <- object$call
  N_G <- object$N_G
  B <- object$B
  type <-
    ifelse(object$type %in% c("rademacher", "mammen", "norm", "webb"),
      object$type,
      "custom"
    )
  # clustid <-
  estim_function <- class(object$regression)

  clustering_type <- paste0(length(object$clustid), "-way")
  numb_clusters <- object$N_G

  tidy_names <-
    c(
      "term",
      "estimate",
      "statistic",
      "p.value",
      "conf.low",
      "conf.high"
    )

  tidy_object <- lapply(
    tidy_names,
    function(x) {
      if (is.numeric(tidy.boottest(object)[[x]])) {
        round(tidy.boottest(object)[[x]], digits = digits)
      } else {
        tidy.boottest(object)[[x]]
      }
    }
  )

  tidy_object <- as.data.frame(tidy_object)
  names(tidy_object) <- tidy_names

  if (object$engine == "WildBootTests.jl") {
    R <- object$R[which(object$R != 0)]
    hypothesis <-
      paste(paste0(paste0(R, "*"), object$param, collapse = "+"), "=", object$r)
  } else {
    hypothesis <-
      paste(
        paste0(
          paste0(
            object$R, "*"
          ),
          object$param,
          collapse = "+"
        ),
        "=",
        object$r
      )
  }

  print(call)
  cat(
    "\t\n",
    sprintf("Hypothesis: %s\n", hypothesis),
    sprintf("Observations: %s\n", N),
    sprintf("Bootstr. Iter: %s\n", B),
    sprintf("Bootstr. Type: %s\n", type),
    sprintf("Clustering: %s\n", clustering_type),
    sprintf("Confidence Sets: %s\n", signif_level),
    sprintf("Number of Clusters: %s\n", Reduce(paste, numb_clusters)),

    # sprintf("Adj. R-Squared: %s\n", round(adj_r_squared,6)),
    sprintf("%s\n", "")
  )

  return(tidy_object)
}

plot.boottest <- function(x, ...) {
  #' Plot the bootstrap distribution of t-statistics
  #' @param x An object of type boottest
  #' @param ... Further arguments passed to or from other methods.
  #' @method plot boottest
  #' @export
  #' @return A plot of bootstrap t-statistics under different null hypotheses
  #' @examples
  #' requireNamespace("fwildclusterboot")
  #' data(voters)
  #' lm_fit <- lm(
  #' proposition_vote ~ treatment + ideology1 + log_income + Q1_immigration,
  #'   data = voters
  #' )
  #' boot <- boottest(lm_fit,
  #'   B = 9999,
  #'   param = "treatment",
  #'   clustid = "group_id1"
  #' )
  #' plot(boot)

  stopifnot(inherits(x, "boottest"))
  dreamerr::validate_dots(stop = TRUE)

  if (is.null(x$conf_int)) {
    rlang::abort(
      c("No plot method if boottest()'s function argument 'conf_int = FALSE'."), 
      use_cli_format = TRUE
    )
  }
  test_vals <- x$grid_vals
  p_test_vals <- x$p_grid_vals
  conf_int <- x$conf_int
  sign_level <- x$sign_level
  xlab <- x$param

  graphics::plot(
    x = test_vals,
    y = p_test_vals,
    type = "b",
    pch = 20,
    lty = 2,
    xlab = xlab,
    ylab = "p-value"
  )
  graphics::lines(test_vals, p_test_vals, type = "l", lty = 1)
  graphics::abline(v = conf_int[1], col = "blue")
  graphics::abline(v = conf_int[2], col = "blue")
  graphics::abline(h = sign_level, col = "red")
}

glance.boottest <- function(x, ...) {
  #' S3 method to glance at objects of class boottest
  #' @param x object of type boottest
  #' @param ... Further arguments passed to or from other methods.
  #' @importFrom generics glance
  #' @method glance boottest
  #' @export
  #' @return A single row summary "glance" of an object of type boottest
  #'         - lists characteristics of the input regression model
  #' @examples
  #' \dontrun{
  #' requireNamespace("fwildclusterboot")
  #' data(voters)
  #' lm_fit <- lm(
  #' proposition_vote ~ treatment + ideology1 + log_income + Q1_immigration,
  #'   data = voters
  #' )
  #' boot <- boottest(lm_fit,
  #'   B = 9999,
  #'   param = "treatment",
  #'   clustid = "group_id1"
  #' )
  #' generics::glance(boot)
  #' }

  stopifnot(inherits(x, "boottest"))
  broom::glance(eval(x$call$object))
}

glance.mboottest <- function(x, ...) {
  #' S3 method to glance at objects of class boottest
  #' @param x object of type mboottest
  #' @param ... Further arguments passed to or from other methods.
  #' @importFrom generics glance
  #' @method glance mboottest
  #' @export
  #' @return A single row summary "glance" of an object of type boottest
  #'         - lists characteristics of the input regression model
  #' @examples
  #' \dontrun{
  #' requireNamespace("fwildclusterboot")
  #' data(voters)
  #' lm_fit <- lm(
  #' proposition_vote ~ treatment + ideology1 + log_income + Q1_immigration,
  #'   data = voters
  #' )
  #' mboot <- mboottest(
  #'     object = lm_fit,
  #'     clustid = "group_id1",
  #'     B = 999,
  #'     R = R
  #' )
  #' generics::glance(mboot)
  #' }
  
  stopifnot(inherits(x, "mboottest"))
  broom::glance(eval(x$call$object))
}


#' S3 method to obtain the wild cluster bootstrapped p-value of an object
#' of type mboottest
#' @param object object of type mboottest
#' @param ... Further arguments passed to or from other methods.
#' @export
#' @method pval mboottest
#' @return A vector containing the boundaries of the wild cluster
#' bootstrapped p-value
#' @examples
#' \dontrun{
#' requireNamespace("clubSandwich")
#' R <- clubSandwich::constrain_zero(2:3, coef(lm_fit))
#' wboottest <-
#'   mboottest(
#'     object = lm_fit,
#'     clustid = "group_id1",
#'     B = 999,
#'     R = R
#'   )
#' pval(wboottest)
#' }
#'
pval.mboottest <- function(object, ...) {
  stopifnot(inherits(object, "mboottest"))

  object$p_val
}

#' S3 method to obtain the non-bootstrapped test statistic calculated
#'  via `mboottest()`
#' @param object An object of type 'mboottest'
#' @param ... Further arguments passed to or from other methods.
#' @export
#' @method teststat mboottest
#' @return A vector containing the non-bootstrapped t-statistic calculated
#' in `mboottest()`
#' @examples
#' \dontrun{
#' requireNamespace("clubSandwich")
#' R <- clubSandwich::constrain_zero(2:3, coef(lm_fit))
#' wboottest <-
#'   mboottest(
#'     object = lm_fit,
#'     clustid = "group_id1",
#'     B = 999,
#'     R = R
#'   )
#' teststat(wboottest)
#' }
#'
teststat.mboottest <- function(object, ...) {
  stopifnot(inherits(object, "mboottest"))

  object$teststat
}


#' S3 method to obtain the effective number of observation used
#' in `mboottest()`
#' @param object object of type mboottest
#' @param ... Further arguments passed to or from other methods.
#' @export
#' @method nobs mboottest
#' @return A scalar containing the effective number of observations
#'  used in `mboottest()`
#' @examples
#' \dontrun{
#' requireNamespace("clubSandwich")
#' R <- clubSandwich::constrain_zero(2:3, coef(lm_fit))
#' wboottest <-
#'   mboottest(
#'     object = lm_fit,
#'     clustid = "group_id1",
#'     B = 999,
#'     R = R
#'   )
#' nobs(wboottest)
#' }
#'
nobs.mboottest <- function(object, ...) {
  stopifnot(inherits(object, "mboottest"))

  object$N
}


#' S3 method to print key information for objects of type `bboottest`
#' @param x object of type boottest
#' @param ... Further arguments passed to or from other methods.
#' @param digits Number of rounding digits
#' @export
#' @method print boottest
#' @return A scalar containing the effective number of observations
#' used in `mboottest`
#' @examples
#' #' requireNamespace("fwildclusterboot")
#' data(voters)
#' lm_fit <- lm(
#'   proposition_vote ~ treatment + ideology1 + log_income + Q1_immigration,
#'   data = voters
#' )
#' boot <- boottest(lm_fit,
#'   B = 9999,
#'   param = "treatment",
#'   clustid = "group_id1"
#' )
#' print(boot)
#'
print.boottest <- function(x, ..., digits = 4) {
  stopifnot(inherits(x, "boottest"))

  print(x$call)
  cat("", "\n")

  vals <- lapply(
    c("p_val", "conf_int", "t_stat"),
    function(y) {
      round(x[[y]], digits = digits)
    }
  )

  cat("p value:", vals[[1]], "\n")
  cat("confidence interval:", vals[[2]], "\n")
  cat("test statistic", vals[[3]], "\n")
}


#' S3 method to print key information for objects of type `mboottest`
#' @param x object of type mboottest
#' @param ... Further arguments passed to or from other methods.
#' @param digits Number of rounding digits
#' @export
#' @method print mboottest
#' @return A scalar containing the effective number of observations used
#' in `mboottest`
#' @examples
#' \dontrun{
#' requireNamespace("clubSandwich")
#' R <- clubSandwich::constrain_zero(2:3, coef(lm_fit))
#' wboottest <-
#'   mboottest(
#'     object = lm_fit,
#'     clustid = "group_id1",
#'     B = 999,
#'     R = R
#'   )
#' print(wboottest)
#' }
#'
print.mboottest <- function(x, ..., digits = 4) {
  stopifnot(inherits(x, "mboottest"))

  print(x$call)
  cat("", "\n")

  vals <- lapply(
    c("p_val", "teststat"),
    function(y) {
      round(x[[y]], digits = digits)
    }
  )

  cat("p value:", vals[[1]], "\n")
  cat("test statistic", vals[[2]], "\n")
}


tidy.mboottest <- function(x, ...) {

  #' S3 method to summarize objects of class mboottest into tidy data.frame
  #' @param x object of type mboottest
  #' @param ... Further arguments passed to or from other methods.
  #' @importFrom generics tidy
  #' @rdname tidy.mboottest
  #' @export
  #'
  #' @method tidy mboottest
  #' @return A tidy data.frame with estimation results for objects of type
  #'         mboottest
  #' @examples
  #' \dontrun{
  #' requireNamespace("clubSandwich")
  #' R <- clubSandwich::constrain_zero(2:3, coef(lm_fit))
  #' wboottest <-
  #'   mboottest(
  #'     object = lm_fit,
  #'     clustid = "group_id1",
  #'     B = 999,
  #'     R = R
  #'   )
  #' summary(wboottest)
  #' print(wboottest)
  #' nobs(wboottest)
  #' pval(wboottest)
  #' generics::tidy(wboottest)
  #' }


  stopifnot(inherits(x, "mboottest"))
  # dreamerr::validate_dots(stop = TRUE)

  statistic <- x$teststat
  p.value <- x$p_val

  res <- data.frame(teststat = statistic, p_val = p.value)

  return(res)
}

summary.mboottest <- function(object, digits = 3, ...) {
  #' S3 method to summarize objects of class mboottest
  #' @param object object of type mboottest
  #' @param digits rounding of output. 3 by default
  #' @param ... Further arguments passed to or from other methods.
  #' @method summary mboottest
  #'
  #' @export
  #'
  #' @return Returns result summaries for objects of type mboottest
  #' @examples
  #' \dontrun{
  #' requireNamespace("clubSandwich")
  #' R <- clubSandwich::constrain_zero(2:3, coef(lm_fit))
  #' wboottest <-
  #'   mboottest(
  #'     object = lm_fit,
  #'     clustid = "group_id1",
  #'     B = 999,
  #'     R = R
  #'   )
  #' summary(wboottest)
  #' print(wboottest)
  #' nobs(wboottest)
  #' pval(wboottest)
  #' generics::tidy(wboottest)
  #' }



  stopifnot(inherits(object, "mboottest"))
  dreamerr::validate_dots(stop = TRUE)

  N <- object$N
  B <- object$B
  call <- object$call
  N_G <- object$N_G
  B <- object$B
  type <- ifelse(
    object$type %in% c("rademacher", "mammen", "norm", "webb"),
    object$type, "custom"
  )

  clustering_type <- paste0(length(object$clustid), "-way")
  numb_clusters <- object$N_G

  tidy_names <- c("teststat", "p_val")

  # rounding
  tidy_object <- lapply(
    tidy_names,
    function(x) {
      if (is.numeric(tidy(object)[[x]])) {
        round(tidy(object)[[x]], digits = digits)
      } else {
        tidy(object)[[x]]
      }
    }
  )

  tidy_object <- as.data.frame(tidy_object)
  names(tidy_object) <- tidy_names

  hypothesis <- "Multivariate mboottest"

  print(call)
  cat(
    "\t\n",
    sprintf("Hypothesis: %s\n", hypothesis),
    sprintf("Observations: %s\n", N),
    sprintf("Bootstr. Iter: %s\n", B),
    sprintf("Bootstr. Type: %s\n", type),
    sprintf("Clustering: %s\n", clustering_type),
    sprintf("Number of Clusters: %s\n", Reduce(paste, numb_clusters)),

    # sprintf("Adj. R-Squared: %s\n", round(adj_r_squared,6)),
    sprintf("%s\n", "")
  )

  tidy(object)
}


#' @importFrom generics tidy
#' @export
generics::tidy

#' @importFrom generics glance
#' @export
generics::glance