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Fit univariate latent change score models

Source: R/fit_lcsm.R
fit_uni_lcsm.Rd

Fit univariate latent change score models.

Usage

fit_uni_lcsm(
  data,
  var,
  model,
  add = NULL,
  mimic = "Mplus",
  estimator = "MLR",
  missing = "FIML",
  return_lavaan_syntax = FALSE,
  ...
)

Arguments

data

A data frame in "wide" format, i.e. one column for each measurement point and one row for each observation.

var

Vector, specifying the variable names of each measurement point sequentially.

model

List of model specifications (logical) for variables specified in var.

  • alpha_constant (Constant change factor)

  • alpha_piecewise (Piecewise constant change factors)

  • alpha_piecewise_num (Changepoint of piecewise constant change factors. In an example with 10 repeated measurements, setting alpha_piecewise_num to 5 would estimate two seperate constant change factors, a first one for changes up to timepoint 5, and a second one for changes from timepoint 5 onwards (in this example timepoint 10).,

  • alpha_linear (Linear change factor)

  • beta (Proportional change factor)

  • phi (Autoregression of change scores)

add

String, lavaan syntax to be added to the model

mimic

See mimic argument in lavOptions.

estimator

See estimator argument in lavOptions.

missing

See missing argument in lavOptions.

return_lavaan_syntax

Logical, if TRUE return the lavaan syntax used for simulating data. To make it look beautiful use the function cat.

...

Additional arguments to be passed to lavOptions.

Value

This function returns a lavaan class object.

References

Ghisletta, P., & McArdle, J. J. (2012). Latent Curve Models and Latent Change Score Models Estimated in R. Structural Equation Modeling: A Multidisciplinary Journal, 19(4), 651–682. doi:10.1080/10705511.2012.713275.

Grimm, K. J., Ram, N., & Estabrook, R. (2017). Growth Modeling—Structural Equation and Multilevel Modeling Approaches. New York: The Guilford Press.

McArdle, J. J. (2009). Latent variable modeling of differences and changes with longitudinal data. Annual Review of Psychology, 60(1), 577–605. doi:10.1146/annurev.psych.60.110707.163612 .

Yves Rosseel (2012). lavaan: An R Package for Structural Equation Modeling. Journal of Statistical Software, 48(2), 1-36. doi:10.18637/jss.v048.i02 .

Examples

# Fit univariate latent change score model
fit_uni_lcsm(data = data_uni_lcsm, 
             var = names(data_uni_lcsm)[2:4],
             model = list(alpha_constant = TRUE, 
                          beta = FALSE, 
                          phi = FALSE))
#> Warning: lavaan WARNING: some cases are empty and will be ignored:
#>   179 223 239 258 306 359 430
#> lavaan 0.6.14 ended normally after 61 iterations
#> 
#>   Estimator                                         ML
#>   Optimization method                           NLMINB
#>   Number of model parameters                         8
#>   Number of equality constraints                     2
#> 
#>                                                   Used       Total
#>   Number of observations                           493         500
#>   Number of missing patterns                         7            
#> 
#> Model Test User Model:
#>                                               Standard      Scaled
#>   Test Statistic                                 0.703       0.704
#>   Degrees of freedom                                 3           3
#>   P-value (Chi-square)                           0.873       0.872
#>   Scaling correction factor                                  0.998
#>     Yuan-Bentler correction (Mplus variant)