再补充一个问题,如下。因变量全是二分类的时候加了class和没有加class 得出结论不一致。
主要在于加class 截距有意义,不加截距没有意义,不加时与spss运行结果一致。这个问题谁能解答下????????
https://bbs.pinggu.org/thread-1539337-1-1.html 帖子谁也帮忙回答下啊,有悬赏!
data sas;
input y a x1 x2 b c x3 x4 d x5 e;
cards;
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1 2 1 1 1 0 0 0 0 0 0
1 2 1 0 1 0 0 0 0 0 0
1 2 1 0 1 0 0 0 0 0 0
1 2 1 0 1 0 0 0 0 0 0
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;
PROC LOGISTIC desc;
MODEL y=a x1 x2 b c x3 x4 d x5 e/selection=stepwise aggregate scale=none;
/*多因素分析,选项aggregate和scale输出Pearson χ2和Deviance值,用于拟合优度评价*/
RUN;
PROC LOGISTIC desc;
MODEL y=a x1 x2 b c x3 x4 d x5 e/selection=forward aggregate scale=none;
/*多因素分析,选项aggregate和scale输出Pearson χ2和Deviance值,用于拟合优度评价*/
RUN;
/*不加class截距无意义,这个区别*/
PROC LOGISTIC desc;
class y a x1 x2 b c x3 x4 d x5 e;
MODEL y=a x1 x2 b c x3 x4 d x5 e/selection=forward aggregate scale=none;
/*多因素分析,选项aggregate和scale输出Pearson χ2和Deviance值,用于拟合优度评价*/
RUN;
/*加class后截距有意义这个区别*/
不加的结果:
Intercept 1 -0.0878 0.3473 0.0640 0.8003
a 1 -0.5322 0.1957 7.3939 0.0065
b 1 0.7236 0.1953 13.7253 0.0002
c 1 0.5032 0.2031 6.1403 0.0132
d 1 1.1735 0.5264 4.9697 0.0258
e 1 0.9672 0.2050 22.2679 <.0001
加的结果:
Intercept 1 0.7976 0.2638 9.1435 0.0025
a 1 1 0.2661 0.0979 7.3939 0.0065
b 0 1 -0.3618 0.0977 13.7253 0.0002
c 0 1 -0.2516 0.1015 6.1403 0.0132
d 0 1 -0.5868 0.2632 4.9697 0.0258
e 0 1 -0.4836 0.1025 22.2679 <.0001