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-Original Message-
From: TGS [mailto:cran.questi...@gmail.com]
Sent: Friday, August 13, 2010 11:51 AM
To: Greg Snow
Cc: r-help@r-project.org
Subject: Re: [R] Dealing with data
# Greg, if R automatically does that then I don't know why it's
treating each
On Aug 13, 2010, at 1:03 PM, TGS wrote:
# how would I code in R to look at the letter of the alphabet
# in the second column and create a indicator column for the
# corresponding letter?
data(InsectSprays)
InsectSprays$spray
It's already what most people mean when they say indicator column,
To clarify, I'd like to create a column of indicators for the respective
letters so that I could maybe do regression on indicators, etc.
For instance, A gets 1, B gets 2, and so on.
On Aug 13, 2010, at 10:19 AM, David Winsemius wrote:
On Aug 13, 2010, at 1:03 PM, TGS wrote:
# how would I
-help-boun...@r-
project.org] On Behalf Of TGS
Sent: Friday, August 13, 2010 11:22 AM
To: David Winsemius
Cc: r-help@r-project.org
Subject: Re: [R] Dealing with data
To clarify, I'd like to create a column of indicators for the
respective letters so that I could maybe do regression
TGS wrote:
To clarify, I'd like to create a column of indicators for the
respective letters so that I could maybe do regression on indicators,
etc.
For instance, A gets 1, B gets 2, and so on.
That's precisely how factors are handled by modeling functions in R!
No need to reinvent the
On Aug 13, 2010, at 1:22 PM, TGS wrote:
To clarify, I'd like to create a column of indicators for the
respective letters so that I could maybe do regression on
indicators, etc.
You can just enter that column name in a regression formula. No need
to create a separate variable. Try:
-Original Message-
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-
project.org] On Behalf Of TGS
Sent: Friday, August 13, 2010 11:22 AM
To: David Winsemius
Cc: r-help@r-project.org
Subject: Re: [R] Dealing with data
To clarify, I'd like to create a column of indicators
Snow
Cc: r-help@r-project.org
Subject: Re: [R] Dealing with data
# Greg, if R automatically does that then I don't know why it's
treating each indicator
# as a different regressor. In other words, I am interested in treating
'spray' as one
# independent variable.
#
# Erik, which book do
-project.org
Subject: Re: [R] Dealing with data
# Greg, if R automatically does that then I don't know why it's
treating each indicator
# as a different regressor. In other words, I am interested in treating
'spray' as one
# independent variable.
#
# Erik, which book do you suggest I read? Thanks
PM
To: Greg Snow
Subject: Re: [R] Dealing with data
P.S. The degrees of freedom for sprays would be 5 and not 1.
On Aug 13, 2010, at 12:27 PM, Greg Snow wrote:
So you want 1 degree of freedom for InsectSprays? You believe that the
difference between A and B is exactly the same
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