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标题: 请教logisitc回归问题 [打印本页]

作者: shiyiming 时间: 2005-5-20 22:10
标题: 请教logisitc回归问题
昨天装了个SAS8.1
但是似乎只能运行线性回归
运行logistic回归时却出错

1 DATA EX2;
2 INPUT X1 X2 D COUNT @ @;
3 CARDS;

NOTE: The data set WORK.EX2 has 4 observations and 4 variables.
NOTE: DATA statement used:
   real time          0.61 seconds
   cpu time          0.05 seconds

8 ;
9 PROC LOGISTIC DESCENDING;
10 FREQ COUNT;
11 MODEL D=X1 X2/SCALE=NONE AGGREGATE;
12 RUN;

ERROR: All observations have the same response.  No statistics are computed.
NOTE: The SAS System stopped processing this step because of errors.
NOTE: There were 4 observations read from the data set WORK.EX2.
NOTE: PROCEDURE LOGISTIC used:
   real time          0.60 seconds
   cpu time          0.06 seconds

现在才刚开始自学
所以很多都不明白
请教哪位高人能指点一二
感激不尽！

作者: shiyiming 时间: 2005-5-30 11:12
标题: 如题
你查看一下你的目标变量，是不是常数！！！
最好把数据也贴出来，别人才能更好的给你查找原因！

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