表示specifies the prior distribution for the regression coefficients.
The default is COEFFPRIOR=UNIFORM, which specifies the noninformative and improper prior of a constant.
Jeffreys’ prior is specified by COEFFPRIOR=JEFFREYS, which can be followed by the following option in parentheses. Jeffreys’ prior is proportional to , where  is the Fisher information matrix. See the section Jeffreys’ Prior and Ibrahim and Laud (1991) for more details.
参考http://support.sas.com/documenta ... _genmod_sect012.htm

谢谢你的回复，关键是myprior数据集里的数据是怎么设置的呢？其中的变量以及均值根据什么计算出来的呢？

这个我也没做过。我找个例子，你看看吧。网上例子很多。包括数据说明，数据集，程序以及输出。