看drawnorm命令的例子

Examples

    Generate 2,000 independent observations (x,y); x with mean 2 and standard deviation .5; y with mean
    3 and standard deviation 2

        . matrix m = (2,3)
        . matrix sd = (.5,2)
        . drawnorm x y, n(2000) means(m) sds(sd)
        . summarize

    Draw a sample of 1,000 observations from a bivariate standard normal distribution, with correlation
    0.5

        . clear
        . matrix C = (1, .5 \ .5, 1)
        . drawnorm x y, n(1000) corr(C)
        . summarize

    Equivalently,

        . clear
        . matrix C = (1, .5, 1)
        . drawnorm x y, n(1000) corr(C) cstorage(lower)
        . summarize