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'''Specify input file (if using different file than default)'''
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'''Specify which observations are valid for matching. '''
*For now, we filter out all firms that were never granted a single patent in the period 1970-2015
*For firms that LBO, we also drop their observations in all other years from the list of candidates to match to other LBOs
Lines 38-48
'''Specify propensity score type to use for matching'''
*Options are: logitp (panel logit), probitp (panel probit), or Cox proportional hazard (hr)
*Alternatively, can use the above, with regressions performed using winsorized values of regressors (trimmed at 1st and 99th percentiles): logitpw, probitpw, hrw
