两条SAS的题目，本人是刚学的SAS，不知道怎么做，求解释

shiyiming

1. How many observations and variables does the data set below contain?
Name Sex Age
Picker M 32
Fletcher 28
Romano F .
Choi M 42
a. 3 observations, 4 variables
b. 3 observations, 3 variables
c. 4 observations, 3 variables
d. can't tell because some values are missing
2. How many program steps are executed when the program below is processed?
data user.tables;
infile jobs;
input date name $ job $;
run;
proc sort data=user.tables;
by name;
run;
proc print data=user.tables;
run;
a. three
b. four
c. five
d. six

shiyiming

1.C
分别是姓名，性别，年龄3个变量，4个观察样本
2.A
一个数据步，2个过程步，分别是排序和输出（打印）
不知道对不对。

shiyiming

<!-- s:D --><img src="{SMILIES_PATH}/icon_biggrin.gif" alt=":D" title="Very Happy" /><!-- s:D -->  <!-- s:D --><img src="{SMILIES_PATH}/icon_biggrin.gif" alt=":D" title="Very Happy" /><!-- s:D -->  <!-- s:D --><img src="{SMILIES_PATH}/icon_biggrin.gif" alt=":D" title="Very Happy" /><!-- s:D -->  <!-- s:D --><img src="{SMILIES_PATH}/icon_biggrin.gif" alt=":D" title="Very Happy" /><!-- s:D --> 就是这样的。