Stat 538 Fall 2005

Homework 11 due in lab Dec. 8

1.  Redo the analysis of Example 12.44 p.582 of SW using Minitab.  You
    do not need to replicate the plots presented there, but you do
    need to confirm the estimates of coefficients are the same as in
    SW.  Interpret the tests of significance and the goodness of fit
    tests.  Explain what the odds ratio means.

2.  Analyze the HPV data on page 102 of the notes using logistic
    regression. You want to compare odds of HPV+ for Cases to that for
    controls.  Compare this to the naive estimate of OR obtained using
    methods as on pages 106-7 of the notes.

3.  The ICU data description and actual data set are on the web page.
    The major goal of the study was to develop a logistic regression
    model to predict the probability of survival to hospital discharge
    of these patients.  There are lots of variables in the data set,
    but just use two - CPR status and AGE - for predicting STA.
    Evaluate the model (within the limits of what we have covered),
    and explain what your analysis says is the relationship between
    CPR status and AGE with probability of survival.