typssch1 dybordsc1 numforms1 yrbuilt1 typssch2 dybordsc2 numforms2 yrbuilt2 typssch3 == 2
typssch1 dybordsc1 numforms1 yrbuilt1 typssch2 dybordsc2 numforms2 yrbuilt2 typssch3 == 1
hhid2 id2 cluster hh uniquely identify observations