How to call the stored results in e()?

[Phuc Nguyen]

I am using did_imputation and I read over the help file. I saw a part about the result regarding Stored result, I post a piece of this part here

Stored results

did_imputation stores the following in e():

Matrices
e(b) A row-vector of the estimates and pre-trend coefficients:
- If horizons is specified, the program returns tauh for each h in the list of horizons.
- If multiple wtr are specified, the program returns tau_v for each v in the list of wtr variables.
- Otherwise the single returned coefficient is called tau.
- In addition, if pretrends is specified, the command returns preh for each pre-trend coefficient h=1..pretrends.
e(V) Corresponding variance-covariance matrix
e(Nt) A row-vector of the number of treated observations used to compute each estimator

Scalars
e(Nc) the number of control observations used in imputation (scalar)
e(pre_chi2), e(pre_p), e(pre_df)
if pretrends is specified, the Wald statistic, pvalue, and dof for the joint test for no pre-trends
e(Niter) the # of iterations to compute SE

I am wondering how to call these value after running a regression by using did_imputation?

[Clyde Schechter]

local n_controls_used = e(Nc) // STORE SCALAR RESULT IN A LOCAL MACRO
scalar n_iter = e(Niter) // STORE SCALAR RESULT IN A SCALAR

matrix V = e(V) // STORE COVARIANCE MATRIX IN A STATA MATRIX
matrix b = e(b) // STORE VECTOR OF ESTIMATES IN A STATA MATRIX

By the way, there is nothing special to did_imputation about this. This process works after any Stata estimation command.