Multilevel Data Analysis
Don Hedeker
Multilevel Data
Reading material: Hedeker, D., Gibbons, R.D., & Flay, B.R. (1994). Random-effects regression models for clustered data with an example from smoking prevention research. Journal of Consulting and Clinical Psychology, 62, 757-765. (pdf file)
Overheads: Multilevel Analysis: An Applied Introduction (pdf file)
Example using SAS PROC MIXED:
TVSFPMIX.SAS - ASCII file with SAS code from analysis of TVSFP dataset using a few different MIXED models. Also includes individual-level and aggregate-level analyses.
TVSFP2B.DAT - ASCII datafile for example above.
Longitudinal Data
Reading material: Hedeker, D. (2004). An introduction to growth modeling. In D. Kaplan (Ed.), Quantitative Methodology for the Social Sciences. Thousand Oaks CA: Sage Publications. (pdf file)
Overheads: Mixed Models for Longitudinal Data: An Applied Introduction (pdf file)
Example using SAS PROC MIXED:
RIESBYM.SAS - ASCII file with SAS code from analysis of Riesby dataset using a few different MIXED models. Includes grouping variable and curvilinear effect of time.
RIESBY.DAT - ASCII datafile for example above.
Missing Values in Longitudinal Data
Reading material: Hedeker, D., & Gibbons, R.D. (1997). Application of random-effects pattern-mixture models for missing data in longitudinal studies. Psychological Methods, 2, 64-78. (pdf file)
Overheads: Mixed Pattern-Mixture Models for Missing Data (pdf file)
Example using SAS PROC MIXED:
schizpm2.sas - ASCII file with SAS code from analysis of NIMH Schizophrenia dataset to perform a pattern-mixture analysis. Includes IML code to do the mixing over the pattern results.
SCHIZREP.DAT - ASCII datafile for example above.
Longitudinal Dichotomous Data
Reading material: Hedeker, D. and Gibbons, R.D. "Longitudinal Data Analysis" (in progress).
Chapter 9: Mixed-effects regression models for binary outcomes. (pdf file)
Overheads: Mixed Models for Longitudinal Dichotomous Data (pdf file)
Example using SAS PROC NLMIXED:
schzbnl.sas - SAS code for mixed-effects logistic regression analysis of NIMH Schizophrenia data.
SCHIZX1.DAT - ASCII datafile for example above.
Longitudinal Ordinal Data
Reading material: Hedeker, D. and Gibbons, R.D. "Longitudinal Data Analysis" (in progress).
Chapter 10: Mixed-effects regression models for ordinal outcomes. (pdf file)
Overheads: Mixed Models for Longitudinal Ordinal Data (pdf file)
Example using SAS PROC NLMIXED:
schzonl.sas - SAS code for mixed-effects ordinal logistic regression analysis of NIMH Schizophrenia data.
Sample Size Estimation for Longitudinal Studies
Reading material: Hedeker, D., Gibbons, R.D., & Waternaux, C. (1999). Sample size estimation for longitudinal designs with attrition: comparing time-related contrasts between two groups. Journal of Educational and Behavioral Statistics, 24:70-93. (pdf file)
Overheads: (pdf file)
RMASS2.EXE contains:
- executable program for sample size determination based on this paper.
RMASS2.PDF contains:
- PDF version of program guide
More information and materials:
Don's short course on Longitudinal Data Analysis
Don's 15-week course on Longitudinal Data Analysis
The MIX website
[此贴子已经被作者于2006-5-2 11:39:49编辑过]