| get_YiGmin1 | R Documentation | 
A function to calculate outcomes for units in the period right before they become treated (this function can also be used to recover covariates, etc. in the period right before a unit becomes treated). For units that do not participate in the treatment (and therefore have group==0), they are assigned their outcome in the last period.
get_YiGmin1(df, idname, yname, tname, gname)
| df | the data.frame used in the function | 
| idname | name of column that holds the unit id | 
| yname | name of column containing the outcome (or other variable) for which to calculate its outcome in the immediate pre-treatment period | 
| tname | name of column that holds the time period | 
| gname | name of column containing the unit's group | 
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