Question About Wave Fixed Effects

[mbargsted]

Hi Jacob,
Thanks for this excellent package. I was wondering though if dmp allows for the inclusion of wave or time dummy variables, as in a typical two-way fixed effect specification. I tried including the time variable specified in the panel_data argument as an independent variable, but I got the error: 'Error in lav_data_full(data = data, group = group, cluster = cluster, : lavaan ERROR: some variables have no values (only missings) or no variance'.
Many thanks in advance,
Matias