Possibly best way to output statistic summaries

estpost sum wheat_2_value wheat_7_value wheat_12_value hay_1_value if xxxx==xxx
esttab using ss.rtf, cells("mean(fmt(2)) sd(fmt(2)) min(fmt(1)) max(fmt(0))") nomtitle nonumber replace label

Source: http://21cresearcher.blogspot.com/2009/09/stata-how-to-export-descriptive.html