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421. Working with spmap and maps
     How do I graph data onto a map with spmap?

422. A comparison of different tests for trend
     Does Stata provide a test for trend?

423. Comparing xtgls with regress, vce(cluster)
     How does xtgls differ from regression clustered with robust standard errors?

424. Negative and missing R-squared for 2SLS/IV
     For two-stage least-squares (2SLS/IV/ivregress) estimates, why is the R-squared statistic not
     printed in some cases?

425. Maximum likelihood estimation with vce(cluster clustvar)
     Are the estimates produced by probit and logit with the vce(cluster clustvar) option true maximum
     likelihood estimates?

426. Marginal effects and the travelvl option
     Running mfx on my dataset takes a long time, and I am worried it may have stopped. How can I tell if
     it is still running?

427. Interpreting coefficients when interactions are in your model
     Why do I see different p-values, etc., when I change the base level for a factor in my regression?

428. Weighted estimation and xtgee
     Why must weights be constant within panel for xtgee?

429. Analysis of multiple failure-time survival data
     How do I analyze multiple failure-time data using Stata?

430. Obtaining marginal effects without standard errors
     When I run mfx, I am getting the warning message “warning: predict() expression unsuitable for
     standard-error calculation; option nose imposed.” What does that mean?



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