Biostat 513 Homework

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Exercises -- The following describes the objective of the exercises and the scale used to score papers.
- Information and description of the scoring scale.
Week 0 Information on STATA and "do" files
- Do File Info
Week 1 Exercises - Due Friday April 12, 2002
- postcript version of Exercise #1
- PDF version of Exercise #1
- prison.dat Data for question #1 -- IV drug use and HIV serostatus
- prison.do STATA "do" file to read character data and then recode as numeric. Uses (2) key commands: encode, and recode.
- prison.do.txt STATA "do" file with ".txt" extension (easier to view).
- HivnetWide.dat Data for question #2 -- Informed Consent Substudy
- Caution -- Be sure to save the data file as a plain text (ASCII) file. Your browser may want to save it as an *.html file -- don't let it! Also, some computers try to recognize the file extension *.dat and control file transfer -- if you have any trouble then try to save the data as "HivnetWideData.txt".
- HivnetWide.txt Documentation for question #2 -- Informed Consent Substudy
- HivnetWide.do An example STATA "do" file for question #2 -- Informed Consent Substudy. You will need to edit the line that uses "infile" and replace the path name for where the data file is on your computer.
- HivnetWide.do.txt STATA "do" file with ".txt" extension (easier to view).
- stata.help1 A brief summary of some of the key STATA epitab commands useful for this exercise.
- Solution Information
  - hw1solution.txt
Week 2 Exercises - Due Monday April 22, 2002
- Postscript version of Exercise #2
- PDF version of Exercise #2
- tuyns.data Grouped data from Ille-et-Vilaine study of oesophageal cancer
- tuyns.txt Documentation
- NewTuyns.data tuyns.dat with a single row for cases, a single row for controls, and a binary disease indicator
- NewTuyns.txt Documentation
- NewTuyns.do Some STATA commands
- NewTuyns-do.txt Some STATA commands with the *.txt extension -- for just looking at the NewTuyns.do file for machines that otherwise want to execute *.do files.
- landis.data Data for question #2
- landis.txt Documentation
- landis.do STATA do file
- landis-do.txt Some STATA commands with the *.txt extension -- for just looking at the landis.do file for machines that otherwise want to execute *.do files.
- athens.dat Data for question #3
- athens.txt Documentation
- athens.do STATA do file
- athens-do.txt Some STATA commands with the *.txt extension -- for just looking at the athens.do file for machines that otherwise want to execute *.do files.
- stata.help2 A brief summary of some of the key STATA epitab commands useful for this exercise.
- Solution Information
Week 3 Exercises - Due Monday April 29, 2002
- Postscript version of Exercise #3
- PDF version of Exercise #3
- NewTuyns.txt Documentation
- NewTuyns.do Some STATA commands
- NewTuyns-do.txt Some STATA commands with the *.txt extension -- for just looking at the NewTuyns.do file for machines that otherwise want to execute *.do files.
- lowbwt.dat Data that is discussed for question #2. You do not need to access or analyze these data to answer the question -- the necessary analysis results are given.
- lowbwt.txt Documentation for the data that is analyzed as part of question #2. This provides more information on the analysis variables.
- stata.help3 A brief summary of some of the key STATA epitab commands useful for this exercise.
- Solution Information
  - hw3solution.txt
  - exer3-1-do.txt
Week 4 Exercises - Due Monday May 6, 2002
- Postscript version of Exercise #4
- PDF version of Exercise #4
- stata.help4 A brief summary of some of the key STATA commands useful for this exercise.
- Comments A few comments regarding the objectives of question 2.
- Solution Information
Week 5 Midterm Review
Week 6 Exercises - Due Friday May 17, 2002
- Postscript version of Exercise #5
- PDF version of Exercise #5
- TuynsC.dat Data
- TuynsC-dat.txt Data with the *.txt file extension.
- TuynsC.txt Documentation
- TuynsC-do.txt Some STATA commands.
- fram-dat.txt Data
- fram-doc.txt Documentation
- framingham-do.txt Some STATA commands to read the data, subset on men over age 40. Also are commands that illustrate some approaches to the analysis of a continuous covariate -- I look at CHD and BMI (body mass index).
- stata.help5 A brief summary of some of the key STATA logistic regression commands useful for this exercise.
- Solution Information
Week 7 Exercises - Due Friday May 24, 2002
- Postscript version of Exercise #6
- PDF version of Exercise #6
- larynx.dat Data -- *.dat extension
- larynx-dat.txt Data -- *.txt extension
- larynx.txt Documentation
- larynx-do.txt Some STATA commands.
- stata.help6 A brief summary of some of the key STATA survival analysis commands useful for this exercise.
- Solution Information
  - hw6solution.txt
  - exer6-3-do.txt
Week 8 Exercises - Due Friday May 31, 2002
- Postscript version of Exercise #7
- PDF version of Exercise #7
- larynx.dat Data -- *.dat extension
- larynx-dat.txt Data -- *.txt extension
- larynx.txt Documentation
- larynx-do.txt Some STATA commands.
- stata.help7 A brief summary of some of the key STATA survival analysis commands useful for this exercise.
- Solution Information
Week 9 Exercises - Due Friday June 7, 2002
- Postscript version of Exercise #8
- PDF version of Exercise #8
- MayoSub.dat Data -- *.dat extension
- MayoSub-dat.txt Data -- *.txt extension
- MayoSub.txt Documentation
- MayoSub-do.txt Some STATA commands.
- addicts_sub.dat Data -- *.dat extension
- addicts_sub-dat.txt Data -- *.txt extension
- addicts_sub.txt Documentation
- addicts_sub-do.txt Some STATA commands.
- stata.help8 A brief summary of some of the key STATA survival analysis commands useful for this exercise.
- Solution Information
Week 10 Final Review