- * Example generated by -dataex-. To install: ssc install dataex
- clear
- input byte t double(volt Illiq HP SP) float(Mt Ft)
- -73 .035788 .0106078220270302 99.7016 99.7861 1 0
- -72 .034828 .107550171333775 99.6909 99.7811 0 0
- -71 .034609 .0754711716472606 99.7028 99.7889 0 0
- -70 .034056 .0463534057763095 99.7087 99.7947 0 0
- -69 .033206 .0794863503633118 99.7465 99.7973 0 1
- -68 .032617 .113047322805958 99.7237 99.8005 1 0
- -67 .033351 .0103897101570354 99.7379 99.808 0 0
- -66 .032483 .0365762861340125 99.7258 99.814 0 0
- -65 .03175 .0461869580537674 99.7343 99.8146 0 0
- -64 .031077 .0013874753632243 99.7481 99.817 0 1
- end
想利用上面数据做下面的分析,其中covs(Illiq HP SP Mt Ft)相当于图中协变量部分,t相当于图中的margin。按下面程序编写代码后运行总显示num和z变量缺失,但不知该如何定义两个变量,请问怎么解决?


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