I have a three-level logistic model: individuals, couples, countries. I need to nest the individuals within the couple, and the couples within the countries. I have seen several different options for programming the subject term, including:
random int / subject = couples;
random int / subject = countries;
random int / couples(countries);
random int countries / subject = couples;
Can someone explain the difference and which would be best to use for my model? Thanks!
Thanks!