10_02 - STAT 420 Examples for 10/02/2007 Fall 2007 1. A...

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STAT 420 Examples for 10/02/2007 Fall 2007 1. A study of the relation of amount of body fat ( Y ) to several possible predictor variables, based on a sample of 20 healthy females 25–34 years old. The possible predictor variables are triceps skinfold thickness ( X 1 ), thigh circumference ( X 2 ), and midarm circumference ( X 3 ). > bodyfat x1 x2 x3 y 1 19.5 43.1 29.1 11.9 2 24.7 49.8 28.2 22.8 3 30.7 51.9 37.0 18.7 4 29.8 54.3 31.1 20.1 5 19.1 42.2 30.9 12.9 6 25.6 53.9 23.7 21.7 7 31.4 58.5 27.6 27.1 8 27.9 52.1 30.6 25.4 9 22.1 49.9 23.2 21.3 10 25.5 53.5 24.8 19.3 11 31.1 56.6 30.0 25.4 12 30.4 56.7 28.3 27.2 13 18.7 46.5 23.0 11.7 14 19.7 44.2 28.6 17.8 15 14.6 42.7 21.3 12.8 16 29.5 54.4 30.1 23.9 17 27.7 55.3 25.7 22.6 18 30.2 58.6 24.6 25.4 19 22.7 48.2 27.1 14.8 20 25.2 51.0 27.5 21.1 > attach(bodyfat) > fit = lm(y ~ x1 + x2 + x3) > summary(fit) Call: lm(formula = y ~ x1 + x2 + x3) Residuals: Min 1Q Median 3Q Max -3.7263 -1.6111 0.3923 1.4656 4.1277
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This note was uploaded on 04/29/2010 for the course STAT stat 420 taught by Professor Stepanov during the Spring '07 term at University of Illinois at Urbana–Champaign.

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10_02 - STAT 420 Examples for 10/02/2007 Fall 2007 1. A...

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