[R] Just 2 more questions - for now!

john seers (IFR) john.seers at bbsrc.ac.uk
Thu Jul 24 14:24:43 CEST 2008



Have a look at:


I am not sure this is right:


Try and code a line that looks more like this with the variables the
names of the columns in your data:

model<-lm(admissions ~ maxitemp + minitemp, data=data)

Have a read of ?formula for more information.

(I usually try and avoid using the name "data" for my data because data
is a function in R.) 



-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Williams, Robin
Sent: 24 July 2008 12:02
To: r-help at r-project.org
Subject: [R] Just 2 more questions - for now!

Hi all,
Thanks for the help with my previous post. 
I have just two more questions for the minute. 
  I think I said in a previous post that I like to use the terminal,
i.e. run rterm.exe. On exiting the terminal, I am asked if I want to
save the workspace. If I hit y (yes), the workspace is just saved as
.rdata in my working directory, does anyone know how I can name it
directly from the terminal? 
  More importantly, I can't then open this file from the terminal.
Obviously loading the file from windows explorer brings up the GUI.
Anyone know the command I need? All I can think of doing is adding
rterm.exe to my path and running it from the command prompt (adding the
file as an argument to my command), but surely there is an easy way to
do this from R? Of course I would like to have the terminal open and
open and close various workspaces in one session, without wanting to
restart R all the time. 
  Finally, I rather embarrasingly can't get lm to work despite reading
the help. I can get it to work with a single explanatory variable, EG
model <- lm(data$admissions~data$maxitemp) but how to include a second
explanatory variable (minitemp)? I keep getting errors. Surely I don't
need to use
c(data$maxitemp,data$minitemp) etc? 
All help greatly appreciated - I am getting there slowly!    

Robin Williams
Met Office summer intern - Health Forecasting
robin.williams at metoffice.gov.uk 


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