[R] lm() function to get coefficients doesn`t work

[Kenneth Cabrera]

Frithjof Weinert wrote:

> Hi,
>
>to get the residuals and coefficients I did the following:
>
>kurse <- read.table("kurse.txt" header=T)
>
>the data:
>
> index   bmw    mru   rwe    vow    kar    sie   bas
>1 159,70 74,18 338,21 89,03 110,30 141,23 178,53 67,97
>2 160,76 73,46 343,66 89,38 110,30 142,66 180,45 68,30
>3 162,45 74,18 349,12 91,54 108,54 146,22 183,12 68,85
>4 162,18 72,74 349,12 92,20 106,43 144,80 181,75 68,52
>5 161,64 72,98 340,93 91,43 101,87 144,08 181,41 68,30
>
Modify the data base "kurse.txt", change "," for ".", R is taking each 
variable
as a factor (character variable).

Use" ." (dot)  for decimal separation, not "," (comma)

>
>
>lm(index ~ bmw + mru + rwe + vow + kar + sie + bas,
>data=kurse)
>
>But instead of getting the coefficients R is giving me this:
>
>(Intercept)  kurse$bmw68,92  kurse$bmw69,39  kurse$bmw69,54
>          2.00            3.00            4.75            1.00
>kurse$bmw69,63  kurse$bmw69,87  kurse$bmw70,11  kurse$bmw70,35
>          8.00           14.00           10.00            7.50
>...... and so on
>
>Warning message: 
>"-" not meaningful for factors in: Ops.factor(y, z$residuals)
>
>Please help. The function is maybe important for my exam.
>
>cu
>Frithjof
>
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