95题,第78题
By default, PROC MEANS computes how many of the below statistics?
Standard deviation, Range, Count, Minimum value, Variance, Mode
a) 2 b) 3 c) 4 d) None of the above
答案是b,3个,除了std dev和min value还有哪个呢?
机经
到处都看到 the _error_ variable can only be used in expression in the data step,
这一题究竟该选啥?