omegaSEM function

Calculate multilevel omega reliability

This function uses multilevel structural equation modelling to calculate between and within reliability using coefficient omega.

omegaSEM(items, id, data, savemodel = FALSE)

Arguments

• items: A character vector giving the variables that map to the items in the scale. Note that these should be reverse scored prior to running this function.
• id: A character string giving the name of the variable that indicates which rows of the dataset belong to the same person or group for the multilevel analysis.
• data: A data table or data frame to be used for analysis.
• savemodel: A logical value indicating whether the underlying model should be saved and returned. Defaults to FALSE.

Returns

a list with two elements, the first, Results contains the estimates for coefficient omega at the within and between level. The next element, Fit contains the entire fitted model from lavaan, if savemodel = TRUE.

Examples

data(aces_daily, package = "JWileymisc")
  omegaSEM(
    items = c("COPEPrb", "COPEPrc", "COPEExp"),
    id = "UserID",
    data = aces_daily,
    savemodel = FALSE)

References

Geldhof, G. J., Preacher, K. J., & Zyphur, M. J. (2014) doi:10.1037/a0032138 "Reliability estimation in a multilevel confirmatory factor analysis framework"