[R] Problems using "lm" in combination with "predict"

Frede Aakmann Tøgersen FredeA.Togersen at agrsci.dk
Mon Aug 6 07:59:43 CEST 2007

> My modelmatrix is of dimension  28x4
> Then I want to make use of the function predict because there 
> confidence.intervals are include.
> My idea was:
> mod <- lm(y~Worktime+Vacation+Illnes+Bankholidays)
> newdate=data.frame(x=c(324,123,0.9,0.1))

Perhaps you want to specify newdate like this

newdate=data.frame(Worktime = 324, Vacation = 123, Illness = 0.9, Bankholidays = 0.1))?

Best regards

Frede Aakmann Tøgersen

Faculty of Agricultural Sciences
Dept. of Genetics and Biotechnology
Blichers Allé 20, P.O. BOX 50
DK-8830 Tjele

Phone:   +45 8999 1900
Direct:  +45 8999 1878

E-mail:  FredeA.Togersen at agrsci.dk
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