I'm trying to obtain predicted values after a linear regression with Stata. However I don't find what the command Predict does with the covariates. I think that the command Adjust holds their values at their means for continuous variables and holds discrete variables at 1/number of categories for discrete covariates. But what does Predict do? Does it hold values at 0 for all covariates?
predict uses own values of covariates for each observation.
adjust is an out-of-date command that has been superseded by
margins. Margins can use own, means/modes/medians/percentiles with the
at() option, or even a mixture of all these. By default,
margins uses own values and then averages over the estimation sample.