Change class factor to numeric
?as.factor states:
To "revert" a factor 'f' to its original
numeric values, 'as.numeric(levels(f))[f]' is recommended and
slightly more efficient than 'as.numeric(as.character(f))
christoph
Petr Pikal wrote:
Hi On 6 May 2005 at 8:51, Paulo Justiniano Ribeiro Jr wrote:
as.numeric()
Not exactly correct. as.numeric(as.character()) gives you what you probably want ,if "mass" is really factor ;) see str(mass) Cheers Petr
On Fri, 6 May 2005, Smit, R. (Robin) (IenT) wrote:
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 -------------------------------------------- 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 at tno.nl http://www.tno.nl/industrie_en_techniek/mobiliteit_en_(transport)/mi lieu studies/environmental_studies_and/ <http://www.tno.nl/industrie_en_techniek/mobiliteit_en_(transport)/m ilie ustudies/environmental_studies_and/> -------------------------------------------- This e-mail and its contents are subject to the DISCLAIMER at http://www.tno.nl/disclaimer/email.html [[alternative HTML version deleted]]
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Paulo Justiniano Ribeiro Jr LEG (Laborat??rio de Estat??stica e Geoinforma????o) Departamento de Estat??stica Universidade Federal do Paran?? Caixa Postal 19.081 CEP 81.531-990 Curitiba, PR - Brasil Tel: (+55) 41 361 3573 Fax: (+55) 41 361 3141 e-mail: paulojus at est.ufpr.br http://www.est.ufpr.br/~paulojus
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Petr Pikal petr.pikal at precheza.cz
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