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251. Interpreting quadchk results
     How should I interpret changing quadchk results?

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

253. The Rasch model in Stata
     Can Stata estimate a Rasch model?

254. Methods for obtaining marginal effects
     What is the difference between the linear and nonlinear methods that mfx uses?

255. Keeping all levels of a variable in the model
     How do I keep all levels of my categorical variable in my model?

256. Marginal effects and time-series operators
     I am using margins after an estimation that has time-series operators in the independent variable
     list. How does margins calculate the means of the independent variables?

257. Running multiple Markov chains in parallel
     How can I run multiple Markov chains in parallel?

258. Small-sample adjustments to the sandwich estimate of variance
     What are some of the small-sample adjustments to the sandwich estimate of variance?

259. Marginal effects of probabilities greater than 1
     I am using a probit model, and margins says that my marginal effect is greater than 1. Can that be
     correct?

260. Define constraints for parameters
     How do I impose the restriction that rho is zero using the heckman command with full ml?



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