[R] problem in caluclaring the multiple regression

[Paul Hiemstra]

man4ish schreef:
> I am trying to calculate the regression for the follwing input data stored in
> 'data.txt' file.I am reading this and storing it in the variable i .then i
> am trying to get the predicted value using f1 as dependent and others
> f2....f10 as independent variables.It is giving the following error. Also i
> want that i shoul get one predicted value for each row(y). What should i do.
> Please help me out i will be thankful to you.
>
> i<-read.table("data.txt",header=FALSE)
> i
>         V1 V2 V3 V4 V5 V6 V7 V8 V9 V10 V11
> 1 molecule f1 f2 f3 f4 f5 f6 f7 f8  f9 f10
> 2       m1  3  7  0  3  0  0  0  1   1   1
> 3       m2  2  7  0  2  0  2  0  1   0   1
> 4       m3  0  0  0  3  0  0  0  3   1   0
> 5       m4  3  7  0  1  3  0  0  0   0   1
>
>  attach(i)
> out<-lm(y~x1+x2+x3+x4+x5+x6+x7+x8+x9+x10)
> Error in eval(expr, envir, enclos) : object "y" not found
>
>   
In the read.table command you have to specify if you have a header that 
gives the column names (which you have). You can do this by specifying 
"header  = TRUE". Additionally, read the documentation of lm() 
carefully. Based on the object "i" the call to lm() should look like 
(after using header=TRUE in read.table)

out <- lm(molecule~f1+...+f10) (used the dots to save some typing)

cheers,
Paul

-- 
Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
Heidelberglaan 2
P.O. Box 80.115
3508 TC Utrecht
Phone:     +31302535773
Fax:    +31302531145
http://intamap.geo.uu.nl/~paul