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This forum is for questions that are specific to Regression Modeling Strategies courses and examples and datasets used in them. The primary web site for the full course in the Vanderbilt Biostatistics graduate course (BIOS330) is http://biostat.mc.vanderbilt.edu/CourseBios330.

For general regression modeling strategies questions go to http://stats.stackexchange.com/questions/tagged/regression-strategies and always tag your questions with the regression-strategies tag.

For questions about R go to http://stackoverflow.com/questions/tagged/r .

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szun...@gmail.com

3/30/17

cph and cost outcomes

Professor Harrell, I wanted to write to thank you for some suggestions last year. I used the Cox

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cph and cost outcomes

Professor Harrell, I wanted to write to thank you for some suggestions last year. I used the Cox

3/30/17

1/12/17

Let's try slack. I've created vbiostatcourse.slack.com. Anyone with a vanderbilt.edu email

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Let's try slack. I've created vbiostatcourse.slack.com. Anyone with a vanderbilt.edu email

1/12/17

Frank Harrell, … Nicholas Strayer7

1/11/17

Google Group vs. Slack

Thanks for the input, and any other thoughts you or anyone has about multiple channels (to better

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Google Group vs. Slack

Thanks for the input, and any other thoughts you or anyone has about multiple channels (to better

1/11/17

1/11/17

Study assignment for Session 2

Please cover through section 2.4.1

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Study assignment for Session 2

Please cover through section 2.4.1

1/11/17

4/8/16

Homework 9 posted

Homework 9 is the last homework assignment. Make sure you are making a lot of progress on your final

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Homework 9 posted

Homework 9 is the last homework assignment. Make sure you are making a lot of progress on your final

4/8/16

3/30/16

Assignment 8 posted

Assignment 8 has been posted. There is a problem 10 that adds to the 9 problems at the end of Chapter

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Assignment 8 posted

Assignment 8 has been posted. There is a problem 10 that adds to the 9 problems at the end of Chapter

3/30/16

Alice Toll, Frank Harrell2

3/28/16

C-Index for Proportional Odds models

Excellent question. Increasing categories generally means more power/information but it doesn't

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C-Index for Proportional Odds models

Excellent question. Increasing categories generally means more power/information but it doesn't

3/28/16

3/21/16

Assignment 7 has been posted.

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Assignment 7 has been posted.

3/21/16

Ryan Jarrett, Frank Harrell2

3/21/16

difference in predictions approach to contrasts

The general answer is that you have to evaluate the contrasts (differences in predictions) at a set

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difference in predictions approach to contrasts

The general answer is that you have to evaluate the contrasts (differences in predictions) at a set

3/21/16

3/17/16

Final Project data

Hi all, For those who are still lack of ideas about final project data, I have a few data set

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Final Project data

Hi all, For those who are still lack of ideas about final project data, I have a few data set

3/17/16

3/13/16

Welcome back from spring break. Assignment 6 has been posted. See you in class Tuesday at 1pm.

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Welcome back from spring break. Assignment 6 has been posted. See you in class Tuesday at 1pm.

3/13/16

3/1/16

Difference Testing Using the Loglikelihood

http://statmodel.com/chidiff.shtml

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Difference Testing Using the Loglikelihood

http://statmodel.com/chidiff.shtml

3/1/16

2/20/16

Study Assignment

Whoops I got ahead of myself. We will do Chapter 9 next, which has no audios. Read this chapter

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Study Assignment

Whoops I got ahead of myself. We will do Chapter 9 next, which has no audios. Read this chapter

2/20/16

2/20/16

Assignment 5; use of discussion board

Assignment 5 is now posted. The lack of use of the discussion board translates to opportunities to

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Assignment 5; use of discussion board

Assignment 5 is now posted. The lack of use of the discussion board translates to opportunities to

2/20/16

1/31/16

Handout updates

Audio recordings have been added through section 4.5 of the notes, and there is a video you should

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Handout updates

Audio recordings have been added through section 4.5 of the notes, and there is a video you should

1/31/16

1/30/16

Solutions posted

Solutions have been posted to the web site for assignment 1. The LaTeX setup for these solutions is

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Solutions posted

Solutions have been posted to the web site for assignment 1. The LaTeX setup for these solutions is

1/30/16

1/27/16

Homework 2 Posted

Homework 2 has been posted, in hw.pdf in link from main course web page. This is a group assignment

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Homework 2 Posted

Homework 2 has been posted, in hw.pdf in link from main course web page. This is a group assignment

1/27/16

1/20/16

Be sure to watch main web page

The table at the bottom of the course's main web page is the place to look at frequently. There

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Be sure to watch main web page

The table at the bottom of the course's main web page is the place to look at frequently. There

1/20/16

1/17/16

Course notes updated

I added more narration and a couple of videos to the course notes as links. Please watch videos

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Course notes updated

I added more narration and a couple of videos to the course notes as links. Please watch videos

1/17/16

Daniel Smith, Frank Harrell2

10/17/15

good / bad validation stats in rms

It's all relative and any cutoffs would be arbitrary. Also, we sometimes worry at the amount of

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good / bad validation stats in rms

It's all relative and any cutoffs would be arbitrary. Also, we sometimes worry at the amount of

10/17/15

Daniel Smith, Frank Harrell2

10/17/15

validate / calibrate in rms

Neither of these are for tuning parameter estimates. They are for telling you how badly the model is

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validate / calibrate in rms

Neither of these are for tuning parameter estimates. They are for telling you how badly the model is

10/17/15

Daniel Smith, Frank Harrell2

10/17/15

Plotting model predictions in rms

I don't recommend getting predictions for all categories then averaging. That would have great

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Plotting model predictions in rms

I don't recommend getting predictions for all categories then averaging. That would have great

10/17/15

Daniel Smith, Frank Harrell2

10/17/15

traditional vs modern selection methods

Loaded questions! Using statistical significance, AIC, Cp, BIC for model selection backfires whether

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traditional vs modern selection methods

Loaded questions! Using statistical significance, AIC, Cp, BIC for model selection backfires whether

10/17/15

Daniel Smith, Frank Harrell2

10/17/15

logistic model with quite a small sample size

We need a more comprehensive rule of thumb that is not really linear in the number of parameters. But

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logistic model with quite a small sample size

We need a more comprehensive rule of thumb that is not really linear in the number of parameters. But

10/17/15

Daniel Smith, Frank Harrell2

10/17/15

Under- or Over-dispersion of GROUPED binary data

It's best not to make a problem more complex than it needs to be. Independent Bernoulli trials

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Under- or Over-dispersion of GROUPED binary data

It's best not to make a problem more complex than it needs to be. Independent Bernoulli trials

10/17/15

Nimish Thakore, Frank Harrell7

10/16/15

(1) SS calculation for fit.mult.impute and (2) df's for rcs

Get it, thanks a lot! Won't bother you more Nimish

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(1) SS calculation for fit.mult.impute and (2) df's for rcs

Get it, thanks a lot! Won't bother you more Nimish

10/16/15

Alvin Jeffery, Frank Harrell2

6/23/15

Approximating PO Models

I wish I could remember where I have a snippet of code that might help. I think the approach is to

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Approximating PO Models

I wish I could remember where I have a snippet of code that might help. I think the approach is to

6/23/15

5/4/15

I am puzzled why model approximation did not fare well for estimating the true linear predictor X*

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I am puzzled why model approximation did not fare well for estimating the true linear predictor X*

5/4/15

Jacquelyn Neal, Frank Harrell2

4/27/15

Using aregImpute for Proportional Odds Model

I only see this mentioned in the help file for fit.mult.impute which says that the problem exists

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Using aregImpute for Proportional Odds Model

I only see this mentioned in the help file for fit.mult.impute which says that the problem exists

4/27/15

Jonathan Chipman, … Frank Harrell12

4/25/15

aregImpute subscript out of bounds

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aregImpute subscript out of bounds

4/25/15

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