lavaan data functions — lav

Utility functions related to the Data slot

# update data slot with new data (of the same size)
lav_data_update(lavdata = NULL, newX = NULL, BOOT.idx = NULL, lavoptions = NULL)

Arguments

lavdata: A lavdata object.
newX: A list of (new) data matrices (per group) of the same size. They will replace the data stored in the internal dataslot.
BOOT.idx: A list of integers. If bootstrapping was used to produce the data in newX, use these indices to adapt the remaining slots.
lavoptions: A named list. The Options lsot from a lavaan object.

Examples

# generate syntax for an independence model
HS.model <- ' visual  =~ x1 + x2 + x3
              textual =~ x4 + x5 + x6
              speed   =~ x7 + x8 + x9 '

fit <- cfa(HS.model, data=HolzingerSwineford1939)
#> Warning: lavaan->lav_model_vcov():  
#>    The variance-covariance matrix of the estimated parameters (vcov) does not 
#>    appear to be positive definite! The smallest eigenvalue (= -1.747972e-02) 
#>    is smaller than zero. This may be a symptom that the model is not 
#>    identified.

# extract data slot and options
lavdata <- fit@Data
lavoptions <- lavInspect(fit, "options")

# create bootstrap sample
boot.idx <- sample(x = nobs(fit), size = nobs(fit), replace = TRUE)
newX <- list(lavdata@X[[1]][boot.idx,])

# generate update lavdata object
newdata <- lav_data_update(lavdata = lavdata, newX = newX, 
                           lavoptions = lavoptions)