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111. Windows memory management
     Why does Windows 98/95/NT seem to be swapping even though I haven't allocated all available memory
     to Stata?

112. Advantages of the robust variance estimator
     What are the advantages of using the robust variance estimator over the standard maximum-likelihood
     variance estimator in logistic regression?

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

114. Multiple clustering levels
     Is it possible to analyze survey data with two or more levels of clustering with the svy commands?

115. Stata 6: Estimating a Cox model with a continuously time-varying parameter
     Stata 6: How do I estimate a Cox model with a continuously time-varying parameter?

116. Citing references for Stata’s cluster-correlated robust variance estimates
     Which references should I cite when using the vce(cluster clustvar) option to obtain Stata’s
     cluster-correlated robust estimate of variance?

117. Creating group identifiers
     How do I create individual identifiers numbered from 1 upwards?

118. Calculating variables containing weighted group summary statistics
     I want to calculate a variable containing weighted group summary statistics, but I do not want to
     collapse the data and egen does not support weights. How can I do this?

119. Box plots and logarithmic scales
     How can I best get box plots on logarithmic scales?

120. xtgee reports convergence not achieved
     Why does xtgee sometimes report that convergence was not achieved?



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