我可以在分段SEM 中使用与 psem 的交互项吗？

Question

我正在尝试在分段SEM 包中使用与 psem 交互的术语，但出现以下错误：

名称错误(B)

 lme(response1 ~ predictor1 * predictor2, data),
 lme(response2 ~ predictor1 * predictor2, data),
  ...)```

lme is in the nlme package

predictor1 is an integer of 7 levels
predictor2 is a factor of 2 levels

The model alone runs fine outside of psem, though. I could not find a reference as to why interaction terms will not work in the function psem.

I appreciate any insights on this. Thanks!

Answer 1

更新：

此 SEM 仅在 predictor2 为整数时才有效