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require(chemCal)
data(massart97ex3)
attach(massart97ex3)
yx <- split(y, x)
ybar <- sapply(yx, mean)
s <- round(sapply(yx, sd), digits = 2)
w <- round(1 / (s^2), digits = 3)
weights <- w[factor(x)]
m <- lm(y ~ x, w = weights)
#calplot(m)
inverse.predict(m, 15, ws = 1.67) # 5.9 +- 2.5
inverse.predict(m, 90, ws = 0.145) # 44.1 +- 7.9
m0 <- lm(y ~ x)
lod(m0)
loq(m0)
loq(m, w.loq = 1.67)
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