连续重装了多次STATA，也换了电脑试了下
. ssc install synth,replace
checking synth consistency and verifying not already installed...
all files already exist and are up to date.

结果运算时发现
. synth cigsale retprice lnincome age15to24 beer cigsale(1975) cigsale(1980) cigsale(1988), trunit(3) trperiod(1989) xperiod(1980(1)1988) figure nested keep(smoking_synth)

file synthopt.plugin not found
(error occurred while loading synth.ado)
r(601);




求高手指点！