problem-10.20
problem-10.20
The output of summary() includes
Coefficients:
Estimate Std. Error t value Pr(>|t|)
(Intercept) -101.9075 23.2918 -4.38 1.4e-05 ***
gestation 0.4503 0.0391 11.52 < 2e-16 ***
age 0.1350 0.1881 0.72 0.473
ht 1.2230 0.2852 4.29 2.1e-05 ***
wt1 0.0308 0.0343 0.90 0.369
dage 0.0603 0.1655 0.36 0.716
dht -0.0783 0.2706 -0.29 0.772
dwt 0.0783 0.0331 2.37 0.018 *
So the coefficients for gestation, ht, and
dwt are flagged.
The AIC choice is found with stepAIC()
> library(MASS) # to load stepAIC
> stepAIC(res.lm)
...
Call:
lm(formula = wt ~ gestation + age + ht + dwt, data = b)
Coefficients:
(Intercept) gestation age ht dwt
-109.1946 0.4532 0.2156 1.3016 0.0756