调查问卷里面写的：FM002. For FM001=1-3, ask “how much did you receive last year? ____yuan or ____yuan/month
对以上选择1-3的收入类型，请回答以下问题：过去一年一共领了多少钱？______元或每个月领多少钱？_______元


为什么stata格式变量中有这么多啊 FM002_1_s2 FM002_2_s1 FM002_2_s2 FM002_3_s1 FM002_3_s2 FM002_4_s1 FM002_4_s2 FM002_5_s1 FM002_5_s2 FM002_6_s1 FM002_6_s2 FM002_7_s1  FM002_7_s2 FM002_8_s1 FM002_8_s2 FM002_9_s1 FM002_9_s2 FM002_10_s1 FM002_10_s2  FM002_a_1_ FM002_a_2_ FM002_a_3_ FM002_a_4_ FM002_a_5_ FM002_a_6_ FM002_a_7_ FM002_a_8_ FM002_a_9_ FM002_a_10_ FM002_b_1_ FM002_b_2_ FM002_b_3_ FM002_b_4_ FM002_b_5_ FM002_b_6_ FM002_b_7_ FM002_b_8_ FM002_b_9_ FM002_b_10_


FM002_2_s2 和  FM002_a_1_ 和FM002_b_1_ 分别是什么意思呢