Stata 15 help for _ms_balance

Title

[P] _ms_balance -- Adjust e(b) by balancing factor-variable covariates

Syntax

_ms_balance [indepvars] [, zero strict]

Description

_ms_balance is a programmer's command that makes an adjusted copy of e(b) by balancing the specified factor-variable covariates in its column stripe. The column names in the adjusted copy of e(b) will no longer refer to the variables in indepvars, and elements that referenced these variables will have been multiplied by a fraction representing a balancing of the levels of the factors in indepvars.

Options

zero specifies that empty cells be treated as true zero estimates with zero variance. This results in a multiplier of 1/k for each factor variable in indepvars, where k is the number of levels for a given factor variable in indepvars. Interactions containing multiple variables in indepvars will be adjusted by the multiplier from each participating factor variable.

By default, _ms_balance uses a multiplier that ignores empty cells. An interaction with k levels and e empty cells will have a multiplier of 1/(k-e) if all its factor variables are in indepvars. Otherwise, the multiplier is determined by the number of nonempty cells for each level-combination of factor variables not in indepvars.

strict specifies that an error be raised if there are any empty cells involving the factor variables in indepvars.

Stored results

_ms_balance stores the following in r():

Matrix r(b) adjusted copy of e(b) r(mult) row vector of the multipliers associated with each element of the original e(b)


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