Examples

    Setup
        . sysuse auto
        . probit foreign weight mpg

    Obtain predicted probabilities
        . predict p

    Calculate and display summary statistics
        . summarize foreign p

    Use rules when making predictions
        . predict p2, rules

    Calculate and display summary statistics
        . summarize foreign p p2

    Ignore rules and exclusion criteria
        . predict p3, asif

    Calculate and display summary statistics
        . summarize foreign p p2 p3


看软件predict的help中的例子
predict 后面只能是一个预测的变量

谢谢！可还是不太明白...

see help section of the postestimation of the probit.  

You need to use

predict probitxb, xb

Yes, I've used it. But I cannot find where the real problem is. Then I want to predict using " gen ..." by hand, with the coefficients got from the logit program.