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371. Fitting a linear regression with interval (inequality) constraints using nl
     How do I fit a linear regression with interval (inequality) constraints in Stata?

372. Using nlcom with long expressions
     Is there a way to estimate a nonlinear combination with nlcom, when the error “expression too
     long” is displayed?

373. Pooling data and performing Chow tests in linear regression
     How can I pool data (and perform Chow tests) in linear regression without constraining the residual
     variances to be equal?

374. Missing values reported by stsum
     Why does stsum sometimes report missing values for the percentiles of survival time?

375. Problems with reshape
     I am having problems with the reshape command. Can you give further guidance?

376. Probability weights, analytic weights, and summary statistics
     Why doesn’t summarize accept pweights?

377. Accounting for clustering with mi impute
     How can I account for clustering when creating imputations with mi impute?

378. Mills’ ratios and censoring direction in the Heckman selection model
     Why are there so many formulas for the inverse of Mills’ ratio?

379. Bivariate probit with partial observability and a single dependent variable
     How do I fit a bivariate probit model with partial observability and a single dependent variable?

380. Guidelines for bootstrap samples
     How large should the bootstrapped samples be relative to the total number of cases in the dataset?



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