190 What is the difference between fixed effect, random effect and mixed effect models? 2010-11-19T00:03:28.163

112 R's lmer cheat sheet 2011-07-17T21:50:47.643

49 Questions about how random effects are specified in lmer 2012-07-03T13:58:54.663

36 What is a difference between random effects-, fixed effects- and marginal model? 2012-01-26T12:56:35.637

30 Modelling longitudinal data where the effect of time varies in functional form between individuals 2010-09-17T07:12:27.057

30 What are easy to interpret, goodness of fit measures for linear mixed effects models? 2012-09-25T07:35:53.793

26 How can I test whether a random effect is significant? 2013-04-15T12:37:39.043

23 What is the mathematical difference between random- and fixed-effects? 2012-04-10T21:39:04.850

23 In a multi-level model, what are the practical implications of estimating versus not-estimating random effect correlation parameters? 2013-02-12T15:42:06.620

22 What is the upside of treating a factor as random in a mixed model? 2014-08-14T18:20:37.657

20 Specifying multiple (separate) random effects in lme 2013-05-10T18:59:47.907

17 Big disagreement in the slope estimate when groups are treated as random vs. fixed in a mixed model 2013-04-20T19:50:13.660

16 How should standard errors for mixed effects model estimates be calculated? 2011-07-25T08:43:32.087

16 In practice how is the random effects covariance matrix calculated in a mixed effects model? 2011-11-29T06:02:31.240

16 Can lmer() use splines as random effects? 2012-09-15T09:35:49.090

16 How can I include random effects into a randomForest 2014-06-17T17:30:50.183

14 Concepts behind fixed/random effects models 2012-08-09T13:01:50.033

14 Proper bootstrapping technique for clustered data? 2012-11-08T21:41:50.897

14 Fixed effect vs random effect when all possibilities are included in a mixed effects model 2014-10-21T19:01:40.570

13 Why do mixed effects models resolve dependency? 2015-04-03T09:25:07.310

11 Understanding the variance of random effects in lmer() models 2013-08-22T18:14:02.793

11 Can (should?) regularization techniques be used in a random effects model? 2014-03-14T19:10:02.817

11 Why does SAS PROC GLIMMIX give me VERY different random slopes than glmer (lme4) for a binomial glmm 2014-09-09T20:55:41.997

10 Crossed random effects and unbalanced data 2012-02-21T22:47:29.953

10 Is there a connection between empirical Bayes and random effects? 2012-06-04T08:25:52.670

10 Why are random effects shrunk towards 0? 2012-07-18T06:39:05.453

9 What model for a challenging data set? (hundreds of time series with a lot of nesting) 2012-05-01T11:03:53.037

9 Fixed vs Random Effects 2013-05-13T18:13:53.150

9 Adding random effect influences coefficient estimates 2013-07-24T09:19:26.983

9 REML or ML to compare two mixed effects models with differing fixed effects, but with the same random effect? 2014-09-25T16:12:55.980

8 Can someone shed light on linear vs. nonlinear mixed-effects? 2011-04-19T18:46:18.587

8 Why the introduction of a random slope effect enlarged the slope's SE? 2012-07-10T18:58:53.483

8 When to include a random effect in a model 2013-01-28T21:02:27.857

8 How close to zero should the sum of the random effects be in GLMM (with lme4) 2013-02-24T04:33:04.157

8 Understanding the effect of a continuous random factor in a mixed effects model 2013-06-12T09:38:57.610

8 What does it mean that random effects are highly correlated? 2013-10-11T17:38:34.780

8 Marginal model versus random-effects model – how to choose between them? An advice for a layman 2014-02-12T08:43:06.490

8 How to use the Hausman test for gender discrimination? 2014-12-04T19:06:58.450

8 Can we model non random factors as random in a multilevel/hierarchical design? 2015-01-04T21:54:14.120

7 Computing inter-rater reliability in R with variable number of ratings? 2011-11-16T19:45:30.850

7 Different random effects in nlme and nlmer 2012-09-06T04:30:45.013

7 REML vs ML stepAIC 2012-10-24T15:33:18.153

7 regression with non-independent data 2013-02-15T17:00:38.013

7 Test for variation using random effects model 2013-07-10T08:31:06.377

7 Interpretation of crossed random effect interactions in lme4 2013-09-03T22:25:17.810

7 Instrumental variables and mixed/multilevel models 2013-12-01T21:46:10.647

7 Should I exclude random effects from a model if they are not statistically significant? 2014-09-09T22:41:43.130

7 Longitudinal data: baseline effect versus random intercept 2014-10-07T19:26:59.250

7 How to implement a mixed model using betareg function in R? 2016-11-26T19:45:47.277

7 What is the best way to estimate the average treatment effect in a longitudinal study? 2017-02-10T13:10:34.947

6 Can random effects apply only to categorical variables? 2011-09-07T22:52:05.480

6 Why is the variance of my random effect negative? 2011-12-10T16:38:48.543

6 Programming a new random effects structure in lme 2011-12-16T17:10:24.300

6 Distribution of random effects 2012-03-26T18:00:24.903

6 Model selection in mixed-model context using lmer 2012-04-23T08:33:37.267

6 Fitting a Poisson GLM mixed model with a random slope and intercept 2012-05-06T02:12:34.420

6 How bad is considering a random effect as a fixed effect? 2013-03-12T16:33:27.590

6 Which model for panel data with dependent variables from [0,1]? 2013-05-08T09:00:54.507

6 Comparing between random effects structures in a linear mixed-effects model 2014-10-01T16:35:16.973

6 Should I cluster my standard errors even when using a multilevel model? 2016-12-11T22:58:50.027

5 Checking assumptions for random effects in nested mixed-effects models in R / S-Plus 2010-08-25T01:57:42.433

5 R: How to "control" for another variable in Linear Mixed Effects Regression model? 2012-04-05T23:08:58.800

5 Formulating a mixed model with nested fixed and random effects 2012-04-30T11:27:34.060

5 Weird denominator degrees of freedom in SAS glimmix 2012-06-08T13:10:45.180

5 Model for circular statistics 2012-08-15T16:13:58.580

5 Why is it valid to account for k-1 intercepts w/ only 1 random intercept parameter? 2012-08-27T17:17:54.407

5 Correct interpretation of Lmer output 2013-04-19T14:52:09.147

5 How many observations per subject are necessary to fit a random slope in a mixed model? 2013-06-12T16:36:21.887

5 Why do random effect models require the effects to be uncorrelated with the input variables, while fixed effect models allow correlation? 2013-07-31T15:34:08.983

5 Relative variances of higher-order vs. lower-order random terms in mixed models 2013-10-15T08:21:54.933

5 Duration analysis of unemployment 2013-10-21T11:16:10.237

5 What diagnostics for random effects logistic regression? 2013-11-20T11:52:18.200

5 Crossed vs. nested & fixed vs. random factors 2014-02-07T17:10:24.247

5 Different estimates of crossed random factor variance using nlme and lme4 2014-03-06T23:09:37.943

5 Testing significance of a random effect glmmADMB model 2014-06-17T18:58:13.940

5 When does the prediction of random effects matter? 2014-08-04T04:04:04.193

5 Can correlated random effects "steal" the variability (and the significance) from the regression coefficient? 2014-09-26T14:09:14.200

5 Predicting with random effects in mgcv gam 2015-01-03T19:19:30.600

5 lme4: Why is AIC no longer displayed when using REML 2015-01-05T14:40:33.320

5 Estimates of random effects in binomial model (lme4) 2015-03-21T21:44:16.687

5 Two methods of adding random effects to a GAM give very different results. Why is this and which one should be used? 2016-02-22T17:33:25.420

5 Random effects in package mgcv 2016-04-27T14:24:51.050

5 Interpretation of glmmPQL() spatial autocorrelation output 2016-07-26T16:17:41.880

5 Use of ICC in multilevel modelling 2016-08-17T06:40:34.437

5 Non-linear mixed model (nlme) with nested random effect, do not know how to include nested random effect when bootstrapping 2016-09-01T20:57:19.283

5 What is the intuition on fixed and random effects models? 2016-10-02T08:52:29.707

5 When to use mixed effect model? 2017-04-24T04:18:53.353

5 BLUP formula for random coefficient models, in form that allows for convenient derivatives WRT loss function 2017-12-06T23:40:01.710

4 Variance components 2010-07-20T08:49:13.050

4 Random effect slopes in linear mixed models 2010-10-19T14:00:19.707

4 Sources of within-cluster correlation other than "random shocks" 2010-11-05T13:32:21.913

4 Expected value of the natural log of a ratio of variances 2011-06-30T17:16:14.507

4 Random effect nested under fixed effect model in R 2011-07-13T18:08:34.193

4 How to run a two-way ANOVA with a random variable followed by pairwise comparisons? 2012-09-15T13:38:41.193

4 Posterior density of nonlinear random effects 2012-10-05T22:45:09.120

4 Covariance structure for random intercepts and slopes 2012-11-21T04:44:47.977

4 Reference needed - Who first introduced linear models, fixed and random effects models? 2013-01-23T12:24:46.243

4 Why is Poisson regression different with glmer and gamlss? 2013-02-18T15:05:44.480

4 Nested vs random effect 2013-02-20T11:52:42.897