如何将这些变量添加到SAS代码中？

我试图在代码中添加三个变量，但得到了错误

263  var Subj bmi_init bmi_final bmi_diff;
ERROR: Variable BMI_INIT not found.
ERROR: Variable BMI_FINAL not found.
ERROR: Variable BMI_DIFF not found.

这是我的密码：

DATA dietdata;
            infile 'Downloads/dietdata.dat';
            input Subj $ 1-3 Height $ 4-5 Wt_init 6-8 Wt_final 9-11;
            input(Height,w.d)
            bmi_init = (Wt_init/2.2) / (Height/0.0254);
            bmi_final = (Wt_final/2.2)/(Height/0.0254);
            bmi_diff = bmi_init - bmi_final

RUN;

PROC PRINT data = dietdata;
var Subj bmi_init bmi_final bmi_diff;
RUN;

还有我的填充内容

00768155150
00272250240
00563240200
00170345298
00365140128
00467225205

试试这个

DATA dietdata;
infile 'Downloads/dietdata.dat';
input Subj $ 1-3 Height $ 4-5 Wt_init 6-8 Wt_final 9-11;
NumHeight = input(Height, 8.);
bmi_init = (Wt_init/2.2) / (NumHeight/0.0254);
bmi_final = (Wt_final/2.2)/(NumHeight/0.0254);
bmi_diff = bmi_init - bmi_final;
RUN;

---

如果你想把身高当作一个数字，为什么你要把它当作一个字符来读呢？你的体重指数公式是错误的。你从英寸到米的转换是错误的。你忘了把高度平方米。您的代码缺少一些分号

下面是使用示例数据的代码。要将其转换为从文件中读取，请通过删除*和CARDS语句以及行内数据行来取消对INFLE和RUN语句的注释

data dietdata;
*  infile 'Downloads/dietdata.dat';
  input Subj $ 1-3 Height 4-5 Wt_init 6-8 Wt_final 9-11;
  bmi_init = (Wt_init/2.2) / (Height*0.0254)**2;
  bmi_final = (Wt_final/2.2)/(Height*0.0254)**2;
  bmi_diff = bmi_init - bmi_final ;
*run;
cards;
00768155150
00272250240
00563240200
00170345298
00365140128
00467225205
;

结果:

                                                              bmi_
Obs    Subj    Height    Wt_init    Wt_final    bmi_init     final     bmi_diff

 1     007       68        155         150       23.6169    22.8551     0.76184
 2     002       72        250         240       33.9770    32.6179     1.35908
 3     005       63        240         200       42.6030    35.5025     7.10050
 4     001       70        345         298       49.6059    42.8480     6.75790
 5     003       65        140         128       23.3459    21.3449     2.00108
 6     004       67        225         205       35.3137    32.1747     3.13899