lavPredictY_cv: Determine an optimal lambda penalty value through...

In lavaan: Latent Variable Analysis

Determine an optimal lambda penalty value through cross-validation

Description

This function can be used to determine an optimal lambda value for the lavPredictY function. based on cross-validation.

Usage

lavPredictY_cv(object, data = NULL,
              xnames = lavNames(object, "ov.x"),
              ynames = lavNames(object, "ov.y"),
              n.folds = 10L,
              lambda.seq = seq(0, 1, 0.1))

Arguments

object	An object of class lavaan.
data	A data.frame, containing the same variables as the data.frame that was used when fitting the model in object.
xnames	The names of the observed variables that should be treated as the x-variables. Can also be a list to allow for a separate set of variable names per group (or block).
ynames	The names of the observed variables that should be treated as the y-variables. It is for these variables that the function will predict the (model-based) values for each observation. Can also be a list to allow for a separate set of variable names per group (or block).
n.folds	Integer. The number of folds to be used during cross-validation.
lambda.seq	An R seq() containing the range of lambda penalty values to be tested during cross-validation.

Details

This function is used to generate an optimal lambda value for lavPredictY predictions to improve prediction accuracy.

References

de Rooij, M., Karch, J.D., Fokkema, M., Bakk, Z., Pratiwi, B.C, and Kelderman, H. (2022) SEM-Based Out-of-Sample Predictions, Structural Equation Modeling: A Multidisciplinary Journal. DOI:10.1080/10705511.2022.2061494

Molina, M. D., Molina, L., & Zappaterra, M. W. (2024). Aspects of Higher Consciousness: A Psychometric Validation and Analysis of a New Model of Mystical Experience. \Sexpr[results=rd]{tools:::Rd_expr_doi("https://doi.org/10.31219/osf.io/cgb6e")}

See Also

lavPredictY to predict the values of (observed) y-variables given the values of (observed) x-variables in a structural equation model.

Examples

colnames(PoliticalDemocracy) <- c("z1", "z2", "z3", "z4", 
                                  "y1", "y2", "y3", "y4", 
                                  "x1", "x2", "x3")

model <- '
  # latent variable definitions
  ind60 =~ x1 + x2 + x3
  dem60 =~ z1 + z2 + z3 + z4
  dem65 =~ y1 + y2 + y3 + y4
  # regressions
  dem60 ~ ind60
  dem65 ~ ind60 + dem60
  # residual correlations
  z1 ~~ y1
  z2 ~~ z4 + y2
  z3 ~~ y3
  z4 ~~ y4
  y2 ~~ y4
'
fit <- sem(model, data = PoliticalDemocracy, meanstructure = TRUE)

percent <- 0.5
nobs <- lavInspect(fit, "ntotal")
idx <- sort(sample(x = nobs, size = floor(percent*nobs)))

xnames = c("z1", "z2", "z3", "z4", "x1", "x2", "x3")
ynames = c("y1", "y2", "y3", "y4")

reg.results <- lavPredictY_cv(
    fit,
    PoliticalDemocracy[-idx, ],
    xnames = xnames,
    ynames = ynames,
    n.folds = 10L,
    lambda.seq = seq(from = .6, to = 2.5, by = .1)
)
lam <- reg.results$lambda.min

lavPredictY(fit, newdata = PoliticalDemocracy[idx,],
                 ynames  = ynames,
                 xnames  = xnames,
                 lambda  = lam)

lavaan documentation built on Sept. 27, 2024, 9:07 a.m.