tag:blogger.com,1999:blog-58089693009795700882024-03-13T12:55:00.296-07:00What's new on the UCLA ATS Statistical Consulting Group web siteatsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.comBlogger51125tag:blogger.com,1999:blog-5808969300979570088.post-17323362530116104532013-11-08T13:41:00.000-08:002013-11-08T13:41:14.902-08:00<b>FAQ:</b> <a href="http://www.ats.ucla.edu/stat/r/faq/R_pmm_mi.htmhttp://">How do I perform multiple imputation using predictive mean matching in R?</a>atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com0tag:blogger.com,1999:blog-5808969300979570088.post-42913510811153662462013-06-11T08:20:00.002-07:002013-06-25T15:04:08.494-07:00What's new in June, 2013<h2>R</h2>
<ul>
<li><strong>FAQ:</strong> <a href="http://www.ats.ucla.edu/stat/r/faq/svy_r_srs.htm">How do I analyze survey data with a simple random sample design?</a></li>
<li><strong>FAQ:</strong> <a href="http://www.ats.ucla.edu/stat/r/faq/svy_r_scpsu.htm">How do I analyze survey data with a stratified design with certainty PSUs?</a></li>
<li><strong>FAQ:</strong> <a href="http://www.ats.ucla.edu/stat/r/faq/svy_r_oscluster.htm">How do I analyze survey data with a one-stage cluster design?</a></li>
<li><strong>FAQ:</strong> <a href="http://www.ats.ucla.edu/stat/r/faq/svy_r_pps.htm">How do I analyze survey data with a probability proportional to size sampling design?</a></li>
<li><strong>FAQ:</strong> <a href="http://www.ats.ucla.edu/stat/r/faq/svy_r_strrs.htm">How do I analyze survey data with a stratified random sampling design?</a></li>
<li><strong>FAQ:</strong> <a href="http://www.ats.ucla.edu/stat/r/faq/svy_r_ss.htm">How do I analyze survey data with a systematic sample design?</a></li>
<li><strong>FAQ:</strong> <a href="http://www.ats.ucla.edu/stat/r/faq/svy_r_rss.htm">How do I analyze survey data with a repeated systematic sample design?</a></li>
<li><strong>FAQ:</strong> <a href="http://www.ats.ucla.edu/stat/r/faq/svy_r_strrsac.htm">How do I analyze survey data with a stratified random sampling with allocation to strata design?</a></li>
<li><strong>FAQ:</strong> <a href="http://www.ats.ucla.edu/stat/r/faq/svy_r_post.htm">How do I analyze survey data with stratification after sampling (poststratification)?</a></li>
<li><strong>FAQ:</strong> <a href="http://www.ats.ucla.edu/stat/r/faq/svy_r_ratioest.htm">How can I do ratio estimation with survey data?</a></li>
<li><strong>FAQ:</strong> <a href="http://www.ats.ucla.edu/stat/r/faq/svy_r_regest.htm">How can I do regression estimation with survey data?</a></li>
</ul>
<h2>Stata</h2>
<ul>
<li><strong>FAQ:</strong> <a href="http://www.ats.ucla.edu/stat/stata/faq/histogram_overlay.htm">How can I overlay two histograms?</a></li>
<li><strong>FAQ:</strong> <a href="http://www.ats.ucla.edu/stat/stata/faq/corr_heat_map.htm">How can I make a correlation matrix heat map?</a></li>
</ul>atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com1tag:blogger.com,1999:blog-5808969300979570088.post-48130857322176850122013-05-13T07:54:00.002-07:002013-05-13T07:58:51.943-07:00What's new in May, 2013<h2>Stata</h2>
<ul>
<li><strong>FAQ:</strong> <a href="http://www.ats.ucla.edu/stat/stata/faq/growth_xtmixed_sem.htm">Linear growth models: xtmixed vs sem</a></li>
</ul>atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com0tag:blogger.com,1999:blog-5808969300979570088.post-33395530207746923922013-03-18T10:32:00.002-07:002013-05-13T07:55:08.729-07:00What's new in March, 2013<h2>SPSS</h2>
<ul>
<li><strong>FAQ:</strong> <a href="http://www.ats.ucla.edu/stat/spss/faq/mixed_margins.htm">How can I graph the predicted values from the fixed part of my mixed command?</a></li>
<li><strong>FAQ:</strong> <a href="http://www.ats.ucla.edu/stat/spss/faq/dropout.htm">How can I calculate time at dropout?</a></li>
</ul>
<h2>Stata</h2>
<ul>
<li><strong>FAQ:</strong> <a href="http://www.ats.ucla.edu/stat/stata/faq/date_year.htm">How can I read dates with both 2-digit and 4-digit year?</a></li>
</ul>
atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com0tag:blogger.com,1999:blog-5808969300979570088.post-82788304043893090702013-01-31T08:34:00.002-08:002013-03-06T08:55:47.857-08:00What's new in February, 2013<h2>Stata</h2><br>
<ul>
<li>FAQ: <a href="http://www.ats.ucla.edu/stat/stata/faq/ml_pca.htm">How can I do multilevel principal components analysis?</a></li>
<li>DAE: <a href="http://www.ats.ucla.edu/stat/stata/dae/melogit.htm">Mixed Effects Logistic Regression</a></li>
<li>FAQ: <a href="http://www.ats.ucla.edu/stat/stata/faq/predictive_margins_xtmelogit.htm">How can I compute predictive margins for xtmelogit with random effects?</a></li>
<li>FAQ: <a href="http://www.ats.ucla.edu/stat/stata/faq/mi_indirect2.htm">How can I compute indirect effects with imputed data? (Method 2)</a></li>
<li>FAQ: <a href="http://www.ats.ucla.edu/stat/stata/faq/mi_indirect.htm">How can I compute indirect effects with imputed data? (Method 1)</a></li>
<li>FAQ: <a href="http://www.ats.ucla.edu/stat/stata/faq/xtmixed_effect_size.htm">How can I estimate effect size for xtmixed?</a></li>
</ul>atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com1tag:blogger.com,1999:blog-5808969300979570088.post-50908376163900505122013-01-02T08:26:00.002-08:002013-01-30T06:08:50.613-08:00What's new in January, 2013<strong>Stata</strong><br />
<ul>
<li>Class: <a href="http://www.ats.ucla.edu/stat/stata/seminars/repeated_measures/repeated_measures_analysis_stata.htm">Repeated Measures Analysis with Stata</a></li>
<li>FAQ: <a href="http://www.ats.ucla.edu/stat/stata/faq/modmedcat2.htm">How can I do moderated mediation with a categorical moderator using sem?</a></li>
<li>FAQ: <a href="http://www.ats.ucla.edu/stat/stata/faq/mc_se.htm">How can I get Monte Carlo standard errors for indirect effects?</a></li>
</ul>
<strong>R</strong><br />
<ul>
<li>Data Analysis Example: <a href="http://www.ats.ucla.edu/stat/r/dae/melogit.htm">Mixed Effects Logistic Regression</a></li>
</ul>atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com0tag:blogger.com,1999:blog-5808969300979570088.post-22484524478725326362012-12-07T10:47:00.003-08:002012-12-07T10:50:07.465-08:00What's new in December, 2012<b>Stata </b><br>
<ul>
<li>FAQ: <a href="http://www.ats.ucla.edu/stat/stata/faq/modmedcat.htm">How can I do moderated mediation with a categorical moderator in Stata?</a></li>
</ul>
atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com0tag:blogger.com,1999:blog-5808969300979570088.post-20685515424874760172012-11-12T09:30:00.005-08:002012-11-12T09:30:31.286-08:00What's new in November, 2012<strong>General</strong><br />
<ul>
<li><a href="http://www.ats.ucla.edu/stat/mult_pkg/glmm.htm">Introduction to Generalized Linear Mixed Models</a></li>
</ul>
atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com0tag:blogger.com,1999:blog-5808969300979570088.post-30255454571176795142012-09-06T11:29:00.002-07:002012-09-23T15:12:35.958-07:00What's new in September, 2012<b>Stata </b><br>
<ul>
<li>FAQ: <a href="http://www.ats.ucla.edu/stat/stata/faq/tab_nway.htm">How can you get 3-way, 4-way, 5-way or more cross tabulation in Stata?</a></li>
<li>FAQ: <a href="http://www.ats.ucla.edu/stat/stata/faq/fake_id.htm">How can I anonymize patient IDs and still be able to decode them, if necessary?</a></li>
</ul>
<b>R</b><br>
<ul>
<li>DAE: <a href="http://www.ats.ucla.edu/stat/R/dae/intreg.htm">Interval Regression</a> Includes 3d animated predicted regression surface.</li>
</ul>atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com0tag:blogger.com,1999:blog-5808969300979570088.post-89519411677583153042012-08-10T11:22:00.001-07:002012-09-04T23:28:52.350-07:00What's New in August, 2012<b>R</b><br />
<ul>
<li>Data Analysis Example: <a href="http://www.ats.ucla.edu/stat/r/dae/ztp.htm">Zero-truncated Poisson Regression</a></li>
<li>Data Analysis Example: <a href="http://www.ats.ucla.edu/stat/r/dae/ztnb.htm">Zero-truncated Negative Binomial Regression</a></li>
<li>Data Analysis Example: <a href="http://www.ats.ucla.edu/stat/R/dae/truncreg.htm">Truncated Regression</a></li>
</ul>
<b>SAS</b><br />
<ul>
<li>Code Fragment: <a href="http://www.ats.ucla.edu/stat/sas/code/hdp.htm">Reading and Analyzing the Hospital Doctor Patient Dataset</a></li>
</ul>
<b>SPSS</b><br />
<ul>
<li>Code Fragment: <a href="http://www.ats.ucla.edu/stat/spss/code/hdp.htm">Reading and Analyzing the Hospital Doctor Patient Dataset</a></li>
</ul>
<b>Stata </b><br />
<ul>
<li>FAQ: <a href="http://www.ats.ucla.edu/stat/stata/faq/adjusted_wald_test.htm">Why doesn't the test of the overall survey regression model in Stata match the results from SAS and SUDAAN?</a></li>
<li>Code Fragment: <a href="http://www.ats.ucla.edu/stat/stata/code/hdp.htm">Reading and Analyzing the Hospital Doctor Patient Dataset</a></li>
<li>Code Fragment: <a href="http://www.ats.ucla.edu/stat/stata/code/coxadjust_mata.htm">Compute Adjusted Values from Cox Model using Mata</a></li>
<li>Code Fragment: <a href="http://www.ats.ucla.edu/stat/stata/code/genkey_mata.htm">Generate Anonymous Keys using Mata</a></li>
</ul>
<b>Mplus </b><br />
<ul>
<li>DAE: <a href="http://www.ats.ucla.edu/stat/mplus/dae/zinb.htm">Zero-inflated negative binomial regression</a></li>
<li>DAE: <a href="http://www.ats.ucla.edu/stat/mplus/dae/ztnb.htm">Zero-truncated negative binomial regression</a></li>
</ul>atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com0tag:blogger.com,1999:blog-5808969300979570088.post-6727095897382205602012-06-29T15:51:00.000-07:002012-07-19T13:58:58.589-07:00What's New in July, 2012<h4>
R</h4>
<ul>
<li><a href="http://www.ats.ucla.edu/stat/R/dae/exlogit.htm">R Data Analysis Examples: (Approximate) Exact Logistic Regression</a></li>
<li><a href="http://www.ats.ucla.edu/stat/R/faq/longitudinal.htm">
FAQ: How can I visualize longitudinal data in ggplot2?</a></li>
<li><a href="http://www.ats.ucla.edu/stat/R/faq/growth.htm">
FAQ: How can I make individual growth curves in ggplot2?</a></li>
<li><a href="http://www.ats.ucla.edu/stat/R/faq/longitudinal.htm">
FAQ: How can I explore different smooths in ggplot2?</a></li>
</ul>
<h4>
Stata</h4>
<ul>
<li><a href="http://www.ats.ucla.edu/stat/stata/faq/mi_svy_logit.htm">FAQ: How can I get margins for a multiply imputed survey logit model? (Stata 12)</a></li>
<li><a href="http://www.ats.ucla.edu/stat/stata/faq/sample_survey_setups.htm">FAQ: Sample setups for commonly used survey data sets</a> </li>
</ul>atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com0tag:blogger.com,1999:blog-5808969300979570088.post-91297672453078017282012-06-04T11:42:00.001-07:002012-07-08T19:40:35.287-07:00What's New in June, 2012<h4>R</h4>
<ul>
<li><a href="http://www.ats.ucla.edu/stat/R/faq/mepoisson.htm">Random coefficient poisson models</a></li>
<li><a href="http://www.ats.ucla.edu/stat/R/faq/memultivariate.htm">Multivariate random coefficient model</a></li>
<li><a href="http://www.ats.ucla.edu/stat/R/faq/ml_mediation2.htm">How can I perform mediation with multilevel data? (Method 2)</a></li>
<li><a href="http://www.ats.ucla.edu/stat/R/pages/mesimulation.htm">R Advanced: Simulating the Hospital Doctor Patient Dataset</a></li>
</ul>
<h4>Stata</h4>
<ul>
<li><a href="http://www.ats.ucla.edu/stat/stata/code/dispersion_mata.htm">Stata Code Fragment: Compute Dispersion using Mata (Stata 12)</a></li>
</ul>
<h4>SAS</h4>
<ul>
<li><a href="http://www.ats.ucla.edu/stat/sas/dae/ztp.htm">Zero Truncated Poisson Regression</a></li>
<li><a href="http://www.ats.ucla.edu/stat/sas/dae/ztnb.htm">Zero Truncated Negative Binomial Regression</a></li>
</ul>atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com0tag:blogger.com,1999:blog-5808969300979570088.post-49352102128616656782012-05-26T11:19:00.000-07:002012-05-26T11:21:50.799-07:00What's New in May, 2012<h4>Stata</h4><ul>
<li><a href="http://www.ats.ucla.edu/stat/stata/faq/mult_grp_mediation.htm">FAQ: How can I compare indirect effects in a multiple group model? (Stata 12)</a></li>
</li>
</ul>atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com0tag:blogger.com,1999:blog-5808969300979570088.post-32028098534387276432012-04-05T13:11:00.010-07:002012-05-02T09:41:48.178-07:00What's New in April, 2012<h4>SPSS</h4><ul><li><a href="http://www.ats.ucla.edu/stat/spss/dae/mlogit.htm">DAE Page: Multinomial Logistic Regression</a></li>
<li><a href="http://www.ats.ucla.edu/stat/SPSS/dae/ologit.htm">DAE Page: Ordinal Logistic Regression</a></li>
<li><a href="http://www.ats.ucla.edu/stat/SPSS/faq/ml_mediation2.htm">FAQ: How can I perform mediation with multilevel data? (Method 2)</a></li>
</ul><h4>SAS</h4><ul><li><a href="http://www.ats.ucla.edu/stat/sas/faq/ml_mediation2.htm">FAQ: How can I perform mediation with multilevel data? (Method 2)</a></li>
<li><a href="http://www.ats.ucla.edu/stat/sas/faq/cens_nlmixed.htm">FAQ: How do I run a random effect tobit model using nlmixed?</a></li>
<li><a href="http://www.ats.ucla.edu/stat/sas/faq/zip_nlmixed.htm">FAQ: How do I run a random effect zero-inflated poisson model using nlmixed?</a></li>
</ul>
<h4>Stata</h4><ul>
<li><a href="http://www.ats.ucla.edu/stat/stata/code/srmr_mata.htm">Compute SRMR from SEM using Mata</a></li>
<li><a href="http://www.ats.ucla.edu/stat/stata/code/distance_mata.htm">Computing the Sum Difference Between Two Lattitude and Longitude Points using Mata</a></li>
</ul>atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com0tag:blogger.com,1999:blog-5808969300979570088.post-85549074399022099422012-03-05T12:07:00.004-08:002012-03-26T17:27:00.171-07:00What's New in March, 2012<a href="http://www.ats.ucla.edu/stat/stata/faq/default.htm">Stata</a> <ul><li><a href="http://www.ats.ucla.edu/stat/stata/faq/ologit_mi_marginsplot.htm">FAQ: How can I get margins and marginsplot on multiply imputated data? (Stata 12)</a></li>
<li><a href="http://www.ats.ucla.edu/stat/stata/faq/ologit_catcon.htm">FAQ: How can I understand a categorical by continuous interaction in ologit? (Stata 12)</a></li>
</ul>atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com0tag:blogger.com,1999:blog-5808969300979570088.post-10066865839285769542012-02-28T11:49:00.003-08:002012-02-28T11:52:14.041-08:00What's New in February, 2012<a href="http://www.ats.ucla.edu/stat/stata/faq/default.htm">Stata</a> <ul><li><a href="http://www.ats.ucla.edu/stat/stata/faq/xtmelogit_prob.htm">FAQ: How can I estimate probabilities that include the random effects in xtmelogit? (revised)</a></li>
</ul>atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com0tag:blogger.com,1999:blog-5808969300979570088.post-14320772441174255202012-01-24T12:53:00.000-08:002012-01-24T12:55:55.105-08:00What's New in January, 2012<a href="http://www.ats.ucla.edu/stat/stata/faq/default.htm">Stata</a> <ul><li><a href="http://www.ats.ucla.edu/stat/stata/faq/contrast12.htm">FAQ: Everything you always wanted to know about contrasts* (*But were afraid to ask)</a></li>
</ul>atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com0tag:blogger.com,1999:blog-5808969300979570088.post-29050996545035932692011-12-07T12:30:00.001-08:002011-12-27T19:23:37.042-08:00What's New in December, 2011<a href="http://www.ats.ucla.edu/stat/stata/faq/default.htm">Stata</a> <ul><li><a href="http://www.ats.ucla.edu/stat/stata/faq/xtmixed12.htm">FAQ: How can I do classical ANOVA designs using xtmixed? (Stata 12)</a></li>
<li><a href="http://www.ats.ucla.edu/stat/stata/faq/binary_cfa.htm">FAQ: How can I do CFA with binary variables?</a></li>
<li><a href="http://www.ats.ucla.edu/stat/stata/faq/ml_mediation2.htm">FAQ: How can I perform mediation with multilevel data? (Method 2)</a></li>
</ul>atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com0tag:blogger.com,1999:blog-5808969300979570088.post-91336062973190367742011-11-16T11:28:00.001-08:002011-12-07T12:29:13.967-08:00What's New in November, 2011<a href="http://www.ats.ucla.edu/stat/spss/faq/default.htm">SPSS</a> <ul><li><a href="http://www.ats.ucla.edu/stat/spss/faq/cell_mean_model.htm">FAQ: How can I test differences in means using a cell means model?</a></li>
</ul><a href="http://www.ats.ucla.edu/stat/stata/faq/default.htm">Stata</a> <ul><li><a href="http://www.ats.ucla.edu/stat/stata/faq/diparm.htm">FAQ: How can I access the random effects after xtmixed using _diparm?</a></li>
<li><a href="http://www.ats.ucla.edu/stat/stata/faq/sem_baseline.htm">FAQ: What are the saturated and baseline models in sem?</a></li>
</ul>atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com0tag:blogger.com,1999:blog-5808969300979570088.post-58094281361184638662011-08-31T13:24:00.000-07:002011-09-07T13:28:55.047-07:00What's New in September, 2011<a href="http://www.ats.ucla.edu/stat/stata/default.htm">Stata</a><br />
<ul><li><a href="http://www.ats.ucla.edu/stat/stata/faq/threeway12.htm">FAQ: How can I understand a three-way interaction in ANOVA? (Stata 12) [revised]</a></li>
<li><a href="http://www.ats.ucla.edu/stat/stata/faq/stata12in11.htm">FAQ: How can I read Stata 12 data files in Stata 11?</a></li>
<li><a href="http://www.ats.ucla.edu/stat/stata/faq/repeated_se.htm">FAQ: How can I test simple effects in repeated measures models? (Stata 12) [revised]</a></li>
<li><a href="http://www.ats.ucla.edu/stat/stata/faq/con3way12.htm">FAQ: How can I understand a 3-way continuous interaction? (Stata 12)</a></li>
</ul>atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com0tag:blogger.com,1999:blog-5808969300979570088.post-1643860892528654792011-08-01T13:05:00.001-07:002011-09-07T11:17:17.755-07:00What's new in August, 2011<a href="http://www.ats.ucla.edu/stat/stata/default.htm">Stata</a><br />
<ul><li><a href="http://www.ats.ucla.edu/stat/stata/paperexamples/gregorich/default.htm">Paper Example: Do self-report instruments allow meaningful comparisons across diverse population groups? Testing measurement invariance using the confirmatory factor analysis framework by Steven E. Gregorich</a></li>
<li><a href="http://www.ats.ucla.edu/stat/stata/faq/logitconcon12.htm">FAQ: How can I understand a continuous by continuous interaction in logistic regression? (Stata 12)</a></li>
<li><a href="http://www.ats.ucla.edu/stat/stata/faq/invariance.htm">FAQ: How can I check measurement invariance using the sem command? (Stata 12)</a></li>
<li><a href="http://www.ats.ucla.edu/stat/stata/faq/logitcatcon12.htm">FAQ: How can I understand a categorical by continuous interaction in logistic regression? (Stata 12)</a></li>
<li><a href="http://www.ats.ucla.edu/stat/stata/faq/logit2by212.htm">FAQ: How can I understand a categorical by categorical interaction in logistic regression? (Stata 12)</a></li>
<li><a href="http://www.ats.ucla.edu/stat/stata/faq/margins_graph12.htm">FAQ: How can I graph the results of the margins command? (Stata 12)</a></li>
<li><a href="http://www.ats.ucla.edu/stat/stata/faq/catcon12.htm">FAQ: How can I understand a categorical by continuous interaction? (Stata 12)</a></li>
<li><a href="http://www.ats.ucla.edu/stat/stata/faq/conconb12.htm">FAQ: How can I understand a continuous by continuous interaction? (Stata 12)</a></li>
<li><a href="http://www.ats.ucla.edu/stat/stata/faq/read_excel.htm">FAQ: How can I read Excel files in Stata? (Stata 12)</a></li>
</ul>atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com0tag:blogger.com,1999:blog-5808969300979570088.post-10982724760413375722011-07-11T13:10:00.000-07:002012-07-07T00:16:44.931-07:00What's New in July, 2011<a href="http://www.ats.ucla.edu/stat/r/default.htm">R</a><br />
<ul></ul><div><ul><li><a href="http://www.ats.ucla.edu/stat/r/faq/testing_contrasts.htm">FAQ: How can I test contrasts in R?</a><br />
</li>
<li><a href="http://www.ats.ucla.edu/stat/r/pages/looping_strings.htm">Code Fragment: How can I loop through a list of strings as variables in a model?</a><br />
</li>
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</ul>atsstathttp://www.blogger.com/profile/17713258209442077999noreply@blogger.com0tag:blogger.com,1999:blog-5808969300979570088.post-2518912246654385812010-11-02T10:55:00.000-07:002010-11-24T11:58:35.065-08:00What's New in November, 2010<a href="http://www.ats.ucla.edu/stat/r/default.htm">R</a><ul><li><a href="http://www.ats.ucla.edu/stat/r/faq/dates.htm">FAQ: How does R handle date values?</a></li>
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