Applied Biostatistics for the Health Sciences. Richard J. Rossi

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1 = Yes 9 Presence of uterine irritability 0 = No UI 1 = Yes 10 Number of physician visits 0 = None FTV during the first trimester 1 = One 2 = Two, etc. 11 Birth weight Grams BWT

      1.4.2 Body Fat Data Set

The Body Fat data set consists of data collected on 252 adult males. The data were originally collected to build a model relating body density and percentage of body fat in adult males to several body measurement variables. These data were originally used in the article “Generalized body composition prediction equation for men using simple measurement techniques,” published in Medicine and Science in Sports and Exercise (Penrose et al., 1985). The variables included in this data set are summarized in Table 1.2. Two data sets have also been created from the Body Fat data set. These data sets have the same variables as the Body Fat data set and were formed by randomly sampling the Body Fat data set to create a training set of 189 observations called bodyfat-tr.xlsx and a validation set or 63 observations called bodyfat-val.xlsx. These data sets are used in the model validation sections of the text.

Table 1.2 A Description of the Variables in the Body Fat Data Set

Variable	Description	Codes/Values	Name
1	Density determined from	Density	Density
	underwater weighing
2	Percent body fat Percent	Percentage	PCTBF
	from Siri’s (1956) equation
3	Age in years	Years	Age
4	Weight in pounds	Pounds	Weight
5	Height in inches	Inches	Height
6	Neck circumference	Centimeters	Neck
7	Chest circumference	Centimeters	Chest
8	Abdomen circumference	Centimeters	Abdomen
9	Hip circumference	Centimeters	Hip
10	Thigh circumference	Centimeters	Thigh
11	Knee circumference	Centimeters	Knee
12	Ankle circumference	Centimeters	Ankle
13	Biceps extended circumference	Centimeters	Biceps
14	Forearm circumference	Centimeters	Forearm
15	Wrist circumference	Centimeters	Wrist
16	Body Mass Index	BMI	BMI
17	Overweight indicator	0 = Not Overweight	Overweight
		1 = Yes
18	Obese indicator	0 = Not Obese	Obese
		1 = Yes

      1.4.3 Coronary Heart Disease Data Set

The Coronary Heart Disease data set consists of 100 observations on patients who were selected in a study on the relationship between the age and the presence of coronary heart disease. The variables included in this data set are summarized in Table 1.3.

Table 1.3 A Description of the Variables in the Coronary Heart Disease Data Set

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Variable	Description	Codes/Values	Name
1	Identification code	ID number	ID
2	Age in years	Years