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The variables from the data set are:
Variable Name
Description
Identification number
1-113
Length of stay
Average length of stay in hospital (in days)
Age
Average age of patients (in years)
Infection risk
Average estimated probability of acquiring infection in hospital (in percent)
Routing culturing ratio
Ratio of number of cultures performed to number of patients without signs or symptoms of pneumonia, times 100
Routine chest X-ray ratio
Ratio of number of X-rays performed to number of patients without signs or symptoms of pneumonia, times 100
Number of beds
Average number of beds in hospital
Medical school affiliation
0 = Yes, 1 = No
Average daily census
Average number of patients in hospital per day
Number of nurses
Average number of full-time licensed practical nurses
Available facilities and services
Percent of 35 potential facilities and services that are provided by the hospital
The goal is to fit the best multiple regression model to the response (infection risk).
Do an analysis using the first 108 observations.
Use the stepwise regression method to see which model is the best. Repeat using subset regression.
Do they agree?
Are there any outliers in the data?
Look for x-outliers, y-outliers, and high-influence points.
Come up with one model that you think best describes the data and can be used for future predictions.
Show the residual plot for this one. Does the model seem appropriate?
Use this model to predict (using prediction interval) y for the last 5 observations of the data and see if the model is doing well.
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