关于动物试验设计（大型寡胎动物）

shiyiming

大型寡胎动物的试验设计一般采用拉丁方试验设计，以下是一个sas原程序，希望大家提出意见。
data qgh;
do numb=1 to 4;
do cow= 1 to 4;
input feed$ milk @@;
end;
end;
cards;
A 11 B 13 C 5 D 4
B 2 C 17 D 6 A 1
C 5 D 2 A 18 B 10
D 1 A 6 B 12 C 3
;
Proc anova;
class numb cow feed;
model milk= numb cow feed;
means feed;
run;
quit;

shiyiming

data qgh;
do numb=1 to 4;
do cow= 1 to 4;
input feed$ milk @@; output;
end;
end;
cards;
A 11 B 13 C 5 D 4
B 2 C 17 D 6 A 1
C 5 D 2 A 18 B 10
D 1 A 6 B 12 C 3
;
Proc anova;
class numb cow feed;
model milk= numb cow feed;
means feed;
run;
quit;

再运行试试，

shiyiming

Right. No (expected) data ouput in the original code. The reason may be because the explict loop masks the implied ouput.
Good point from SXLION.

shiyiming

谢谢，这个output语句太重要了。学习了。