predict.trending_fit: Predict method for trending_fit object

In trending: Model Temporal Trends

Predict method for trending_fit object

Description

Adds estimated values and associated confidence and/or prediction intervals to trending_fit objects.

Usage

## S3 method for class 'trending_fit'
predict(
  object,
  new_data,
  name = "estimate",
  alpha = 0.05,
  add_ci = TRUE,
  ci_names = c("lower_ci", "upper_ci"),
  add_pi = TRUE,
  pi_names = c("lower_pi", "upper_pi"),
  simulate_pi = FALSE,
  sims = 2000,
  uncertain = TRUE,
  as_tibble = TRUE,
  ...
)

Arguments

object	A trending_fit object.
new_data	A data.frame containing data for which estimates are to be derived. If missing, the model frame from the fit data will be used.
name	Character vector of length one giving the name to use for the calculated estimate.
alpha	The alpha threshold to be used for prediction intervals, defaulting to 0.05, i.e. 95% prediction intervals are derived.
add_ci	Should a confidence interval be added to the output. Default TRUE.
ci_names	Names to use for the resulting confidence intervals.
add_pi	Should a prediction interval be added to the output. Default TRUE.
pi_names	Names to use for the resulting prediction intervals.
simulate_pi	Should the prediction intervals for glm models be simulated. If TRUE, default, predict() uses the ciTools::add_pi() function to generate the intervals.
sims	The number of simulations to run when simulating prediction intervals for a glm model.
uncertain	Only used for glm models and when simulate_pi = FALSE. Default TRUE. If FALSE uncertainty in the fitted parameters is ignored when generating the parametric prediction intervals.
as_tibble	Should the output be converted to a tibble subclass.
...	Not currently used.

Value

If as_tibble = FALSE, a trending_predict object, which is a list subclass, with entries:

• result: the input data frame with additional estimates and, optionally, confidence and or prediction intervals. NULL if the associated predict method fails.

• warnings: any warnings generated during prediction.

• errors: any errors generated during prediction.

If as_tibble = TRUE, a trending_predict_tbl object which is a tibble subclass with one row per model and columns 'result', 'warnings' and 'errors' with contents as above.

Author(s)

Tim Taylor

See Also

predict.trending_fit_tbl() and predict.trending_model()

Examples

x = rnorm(100, mean = 0)
y = rpois(n = 100, lambda = exp(1.5 + 0.5*x))
dat <- data.frame(x = x, y = y)
poisson_model <- glm_model(y ~ x , family = "poisson")
fitted_poisson <- fit(poisson_model, dat)
predict(fitted_poisson)
predict(fitted_poisson, as_tibble = FALSE)

trending documentation built on April 4, 2023, 1:07 a.m.