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### Regression tests for which the printed output is the issue
### May fail, e.g. by needing Recommended packages
# postscript("reg-tests-3.ps")
## str() for character & factors with NA (levels), and for Surv objects:
ff <- factor(c(2:1, NA), exclude = NULL)
str(levels(ff))
str(ff)
str(ordered(ff, exclude=NULL))
if(require(survival)) {
data(aml)
(sa <- Surv(aml$time, aml$status))
str(sa)
detach("package:survival")
}
## were different, the last one failed in 1.6.2 (at least)
## lm.influence where hat[1] == 1
if(require(MASS)) {
fit <- lm(formula = 1000/MPG.city ~ Weight + Cylinders + Type + EngineSize + DriveTrain, data = Cars93)
print(lm.influence(fit))
## row 57 should have hat = 1 and resid=0.
summary(influence.measures(fit))
}
## only last two cols in row 57 should be influential
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