How to do a trend analysis in Stata

Tips - Stata: How to do a trend analysis in Stata

• -nptrend- performs the nonparametric test for trend across ordered groups.

    .nptrend exposure, by(grp)
    also see How can I test for a trend across a categorical variable?

• -vwls- estimates a linear regression using variance-weighted least squares.

    .vwls prev year,sd(se_prev)

• Does Stata provide a test for trend?

• Usually, after an analysis like regression you can test trend, I use -contrast- and orthogonal polynomial coefficient contrast to examine the linear or higher order trend.
• I also use other software like Joinpoint Regression Program, a handy tool by NCI, for trend analysis.