I am attempting to develop a multiple regression model using selected
model variables that should all be treated as numeric (mostly real)
values.
However, R considers one specific variable "mass" automatically to be of
class "factor", probably because "mass" consists of integer values that
are repeated.
I now want to force R to treat "mass" as a numeric variable in the
regression but am not sure how to do this.
 
> class(mass) <- "numeric"
 
does not help me.
 
Could anyone advise me on this?
 
Kind regards,
Robin Smit


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TNO Science & Technology

Business Unit Automotive
Environmental Studies & Testing
PO Box 6033, 2600 JA Delft
THE NETHERLANDS

ph. +31 (0)15 269 7464
fax +31 (0)15 269 6874
robin.smit@tno.nl
http://www.tno.nl/industrie_en_techniek/mobiliteit_en_(transport)/milieu
studies/environmental_studies_and/
<http://www.tno.nl/industrie_en_techniek/mobiliteit_en_(transport)/milie
ustudies/environmental_studies_and/> 

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