Analyzing Medical Data Using S-PLUS (Statistics for Biology by Brian Everitt

By Brian Everitt

Every one bankruptcy involves simple statistical idea, basic examples of S-PLUS code, plus extra complicated examples of S-PLUS code, and routines. All facts units are taken from actual clinical investigations and may be on hand on a website. The examples within the publication comprise large graphical research to focus on one of many top positive factors of S-PLUS. Written with few information of S-PLUS and no more technical descriptions, the booklet concentrates completely on scientific info units, demonstrating the flexibleness of S-PLUS and its large merits, fairly for utilized clinical statisticians.

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Extra info for Analyzing Medical Data Using S-PLUS (Statistics for Biology and Health)

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1 Introduction The first steps to understanding the general characteristics of any data set are to calculate relevant summary statistics for the data and to graph the data in some way. Which graphs and which summary statistics are most appropriate will largely depend on the type of observations and measurements that have been recorded. In this chapter, we shall illustrate the possibilities using a number of data sets containing continuous or categorical variables. 1 shows the heights in centimeters of a sample of 351 elderly women, randomly selected from the community in a study of osteoporosis.

Arrange the sample as a 10 x 5 matrix, A. 2. Give A suitable row and column names. 3. Set the first two elements of row 2 and the third and fifth elements of row 5 of A to missing. 4. Find the mean of the nonmissing values of A. 5. Find the column and row means of the non-missing values of A. 3 Write a function that replaces any missing value in an n x p matrix by either the mean or the median of the nonmissing values in the same column. Allow the user of the function to select which summary measure is used.

6. ) We can change the default value of graphics parameters before plotting using the par () function. One parameter we will frequently set using the parO function is mfrow, which allows several graphs to be plotted on the same graphics window. 5. Box plot. 6. Scatterplot. 2 31 32 1. 7. Scatterplot with regression line. 5. 6. Plotting parameters Parameter type="p"/"l"/"h"/"s"/"n", etc. axes=T/F main sub xlab,ylab xlim,ylim=c(min,max) pch=1/2/3, etc. or pCh=I+" /". ", etc. Ity=1/2/3, etc. 8. Three scatterplots.

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