PROC SQL中逻辑判别和描述性统计函数怎么用

这篇文章主要介绍了PROC SQL中逻辑判别和描述性统计函数怎么用，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。

1.逻辑表达：>,<,!=,....

*data step;data class_flags;   set sashelp.class;   tall = (height > 60);   male = (sex = 'M');   female = (sex = 'F');run;*proc sql;proc sql;   select name,           (height > 60) as tall,           (sex = 'M') as male,           (sex = 'F') as female   from sashelp.class;quit;

2.描述性统计函数sum(),mean(),....

proc sql;   select sex,           max(height) as max_ht,           mean(weight) as mean_wt   from sashelp.class   group by sex;quit;proc sql;   select age,           max(height*height/weight) as max_body_mass_index   from sashelp.class   group by age;quit;

3.联合使用

proc sql;   select max(height > 60) as any_tall,           mean(weight > 100) as pct_heavy,          sum(gender = 'F') as num_female   from sashelp.class;quit;

proc sql;   select sex,          max(height > 60) as any_tall, mean(weight > 100) as pct_heavy   from sashelp.class   group by sex;quit;

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