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111. 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?

112. Getting histograms with varying bin widths
     How can I get a histogram with varying bin widths?

113. Interpreting the intercept in the fixed-effects model
     How can there be an intercept in the fixed-effects model estimated by xtreg, fe?

114. Saving one or more parts of a dataset
     How can I save one or more parts of a large dataset?

115. Using Matplotlib with Stata
     How do I use Matplotlib with Stata?

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

117. The anova command and collinearity
     How does the anova command handle collinearity?

118. 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?

119. Marginal effects after estimations with weights
     Can I use mfx on survey data with unweighted means?

120. Marginal effects after estimations with weights
     Can I use mfx on survey data with unweighted means?



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