Description Usage Format Source Examples
The dataset is a subsample of the 5 x 2 factorial experiment given by Ostle and Mensing (1963).
1 |
A data frame with 30 observations on the following 3 variables.
cut
type of specimen cut.
lot
lof of the material – I
, II
, III
, IV
and V
.
y
observations of the impact strength.
Ostle B, Mensing RW (1963). Statistics in Research: Basic Concepts and Techniques for Research Workers. Iowa State University.
1 2 3 4 5 6 7 |
Loading required package: MASS
Call:
glm(formula = y ~ cut * lot, family = inverse.gaussian("inverse"),
data = strength)
Deviance Residuals:
Min 1Q Median 3Q Max
-0.236043 -0.101266 0.006794 0.091202 0.237815
Coefficients:
Estimate Std. Error t value Pr(>|t|)
(Intercept) 1.01695 0.08446 12.041 1.28e-10 ***
cut Crosswise 0.32834 0.12873 2.551 0.0190 *
lot II 0.03200 0.12038 0.266 0.7931
lot III 0.35920 0.12956 2.772 0.0118 *
lot IV 0.14135 0.12353 1.144 0.2660
lot V 0.82354 0.14158 5.817 1.08e-05 ***
cut Crosswise:lot II -0.40642 0.17532 -2.318 0.0312 *
cut Crosswise:lot III -0.10874 0.19343 -0.562 0.5802
cut Crosswise:lot IV -0.35028 0.18074 -1.938 0.0669 .
cut Crosswise:lot V -0.19515 0.20815 -0.938 0.3597
---
Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
(Dispersion parameter for inverse.gaussian family taken to be 0.02104379)
Null deviance: 2.62972 on 29 degrees of freedom
Residual deviance: 0.42546 on 20 degrees of freedom
AIC: -45.157
Number of Fisher Scoring iterations: 2
Df Value P-value
Score 4 7.69 0.1037
Modified score 4 6.42 0.1700
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