What is the difference between saving and savings? Money: Although it is no longer backed by anything and it has not been in almost a hundred years, money is still taken to have value. This is because people work to earn it and use it to purchase various things they need and pay for...
Treated cohort: g Pre-treatment period: g − 1 23 ∙ Technically, the ES (leads and lags) only requires that PT holds starting in period g − 1. ∙ Extended TWFE (lags only) effectively averages the pre-treatment periods. ∙ Might be a tradeoff between efficiency and robustness...
The default for covstate() also differs between the error-form syntax and the covariance-form syn- tax. Because the coefficients on the errors in the error-form syntax are frequently used to estimate the standard deviation of the errors, covstate(identity) is the default for the error-form ...
The distribution of population that mixes between lognormal data and zero values is called "a delta-lognormal distribution". Numerous methods are available for constructing confidence intervals for the mean and the ratio or difference of two means for the delta-lognormal populations; see, e.g.,...