以下是我的程序
proc reg data=test outest=regtest;
model rr=mktret D1 D2 D3 D4 D5 D6;/*event day*/
by sktno_v;
run;
请问为何在跑回归时,没有by sktno_v时,可以run,但加上sktno_v(按照每间公司)
Log就会出现ERROR: No valid observations are found.
Log 如下
NOTE: 496 observations read.
NOTE: 496 observations have missing values.
NOTE: 0 observations used in computations.
ERROR: No valid observations are found.
NOTE: The above message was for the following by-group:
sktno_v=1102