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Refer to the Prostate cancer data set in Appendix C.S and Case Study 9.30. For the best subset model developed in Case Study 9.30, perform appropriate diagnostic checks to evaluate outliers and assess their influence. Do any serious multicollinearity problems exist here?
Case Study 9.30
Refer to the Prostate cancer data set in Appendix C5. Serum prostate-specific antigen (PSA) was determined in 97 men with advanced prostate cancer. PSA is a well-established screening test for prostate cancer and the oncologists wanted to examine the correlation between level of PSA and a number of clinical measures for men who were about to undergo radical prostatectomy. The measures are cancer volume, prostate weight. patient age, the amount of benign prostatic hyperplasia. seminal vesicle invasion, capsular penetration, and Gleason score. Select a random sample of 65 observations to use as the model-building data set. Develop a best subset model for predicting PSA. Justify your choice of model. Assess your model's ability to predict and discuss its usefulness to the oncologists.
Appendix C5
A university medical center urology group was interested in the association between prostate-specific antigen (PSA) and a number of prognostic clinical measurements in men with advanced prostate cancer. Data were collected on 97 men who were about to undergo radical prostectomies. Each line of the data set has an identification number and provides information on 8 other variables for each person. The 9 variables are:
why is it so important to periodically take a physical inventory when using a perpetual inventory system? does the
At.01 significance level, can we conclude that there is more variation in selling prices of oceanfront homes?
Find the critical value for different types of sample size and level of significance:
For each player, determine the minimum, the first quartile, the median, the third quartile, and the maximum of their home run totals. Use these results to construct comparative box-and-whisker plots.
1. An experiment has four possible outcomes A, B, C, and D. Check whether the following assignments of probability are possible:
You are trying to set up a portfolio that consists of a corporate bond fund and a common stock fund. the following information about the annual return (per $1,000)of each of these investments under different economic condition is available
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To estimate the average length of time spent in Barbados by long stay tourists, 150 immigration records were reviewed. The sample produced a mean stay of 8.8 days, with a standard deviation of 6 days.
Copy the Assignment Data (i.e., cake mix data) to Sheet 1, cells A1:P32, of the new Excel workbook. Enter the following labels in cells A34:A36: Point Estimate, Lower bound of the 95% Confidence Interval, and Upper Bound of the 95% Confidence Inter..
the most common therapy for warts is cryotherapy in which liquid nitrogen is applied to the area of the wart every few
specimens of blood from 10 different animals were analyzed for blood count say y in units of 100 and packed cell volume
Target population: Heart Disease Patients in the United States and research variable:Heart Disease Smokers -
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