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  • seasonal adjustment on panel data with gaps

    I'm using Stata 14 with windows 10 OS.

    I have quarterly panel data with gaps. I want to perform a diff-in-diff PSM with 1 quarter before and after the treatment event. However, my data always peaks on first quarter and decreases until 4th. Thus, I need to make an adjustment to avoid the effect of seasonality. Because data is decreasing from 1st quarter to 4th, I have always a decrease movement, which influences the treatment effect.

    Here is a pick of my data.

    Code:
    * Example generated by -dataex-. To install: ssc install dataex
    clear
    input float(qdate TCrecta)
    192  .4358174
    193  .2389822
    194  .1662051
    195 .12095518
    196 .50530744
    197  .2156143
    198 .20020433
    199 .11237031
    200 .44876075
    201 .22907463
    202 .13736281
    203 .11492734
    end
    format %tq qdate
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