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這篇文章主要介紹了PROC SQL中邏輯判別和描述性統計函數怎么用,具有一定借鑒價值,感興趣的朋友可以參考下,希望大家閱讀完這篇文章之后大有收獲,下面讓小編帶著大家一起了解一下。
1.邏輯表達:>,<,!=,....
*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.描述性統計函數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.聯合使用
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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