# [Rd] lm documentation, "formula" component (PR#1105)

**Peter Dalgaard BSA
**
p.dalgaard@biostat.ku.dk

*01 Oct 2001 15:21:46 +0200*

david.firth@nuf.ox.ac.uk writes:
>* Full_Name: David Firth
*>* Version: 1.3.1
*>* OS: linux and others
*>* Submission from: (NULL) (163.1.103.121)
*>*
*>*
*>* help(lm)
*>*
*>* says that
*>*
*>* An object of class `"lm"' is a list containing at least the
*>* following components:
*>*
*>* ...
*>*
*>* formula: the formula supplied.
*>*
*>*
*>* But is the "formula" component necessarily present?
*>*
*>* An example:
*>* > x<-rnorm(10)
*>* > y<-rnorm(10)
*>* > temp<-lm(y~x)
*>* > names(temp)
*>* [1] "coefficients" "residuals" "effects" "rank"
*>* [5] "fitted.values" "assign" "qr" "df.residual"
*>* [9] "xlevels" "call" "terms" "model"
*>* > temp$formula
*>* NULL
*
Nicely spotted. Yes, it's present:
>* formula(temp)
*y ~ x
However, it is part of the terms (and model) component, not a
component in itself (str(temp) to see it) so should probably not be
documented as such.
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk) FAX: (+45) 35327907
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