唔……一向都是打开数据的窗口，view-descriptive statistics & test - stats table 然后从上面找mean和sum的。。。。其他的方法就不知道了。。。。

@sum(x[,s])
@mean(x[,s])

X is data serie
[s]: sample expression in double quotes or name of a sample object. The optional sample argument may only be used if the result is assigned to a series. For @quantile, you must provide the method option argument in order to include the optional sample argument.

@SUM(X)序列X的和
@MEAN(X)序列X的平均数
按ENTER结果会显示在最下方