Dear Ellison,
thanks a lot for your reply. Your explanation makes things much clearer.
Sincerely,
f.
On 24 January 2013 05:58, S Ellison s.elli...@lgcgroup.com wrote:
On 23 Jan 2013, at 21:36, Francesco Sarracino f.sarrac...@gmail.com
wrote:
what I meant refers to the fact that
Dear R listers,
I am trying to compute the mean of a dummy variable that is encoded as a
factor. However, even though the levels of my factor are 0 - 1, when I
compute the mean (after coercing the factor to be
numeric), R changes 0 into 1 and 1 into yes, thus altering my expected
result.
Please,
Check R FAQ 7.10: How do I convert factors to numeric?
I hope it helps.
Best,
Dimitris
On 1/23/2013 10:33 AM, Francesco Sarracino wrote:
Dear R listers,
I am trying to compute the mean of a dummy variable that is encoded as a
factor. However, even though the levels of my factor are 0 - 1,
Dear Dimitris,
thanks for your quick reply. I've tried the solutions proposed in 7.10 How
do I convert factors to numeric?
as.numeric(as.character(pp))
and
as.numeric(levels(pp))[as.integer(pp)]
However, whatever I do, I get Warning message: NAs introduced by coercion
and the output is a vector
check also
pp - rep(0:1, 10)
pp - factor(pp, levels=(0:1), labels=c(no,yes))
unclass(pp)
unclass(pp) - 1
Best,
Dimitris
On 1/23/2013 10:48 AM, Francesco Sarracino wrote:
Dear Dimitris,
thanks for your quick reply. I've tried the solutions proposed in 7.10
How do I convert factors to
Thanks,
this works! but I am surprised that R has such a strange behavior and that
there is no way to control it.
BTW, also as.integer(pp)-1 works!
Still, it doesn't look to me as a first best.
At any rate, thanks a lot for your help.
f.
On 23 January 2013 10:53, D. Rizopoulos
On Jan 23, 2013, at 1:58 AM, Francesco Sarracino wrote:
Thanks,
this works! but I am surprised that R has such a strange behavior
and that
there is no way to control it.
BTW, also as.integer(pp)-1 works!
Still, it doesn't look to me as a first best.
At any rate, thanks a lot for your help.
To find the proportion of yess in pp you can use
mean(pp == yes)
and avoid the conversion of a factor to integer (and
subtracting 1). The above works for character and factor
pp.
Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
-Original Message-
From:
Given that your labels are no and yes, what do you expect R to
do? To quote a well-known fortune, R is lacking a mind_read() function!
cheers,
Rolf Turner
On 01/23/2013 10:58 PM, Francesco Sarracino wrote:
Thanks,
this works! but I am surprised that R has such a strange behavior
Thank you all for your replies. Let me try to explain my point: first of
all, let me clarify that I didn't mean to criticize anyone (or anything).
Secondly, what I meant refers to the fact that I've read on an R and
S-plus companion to applied regression about methods to alter the encoding
of
On 23 Jan 2013, at 21:36, Francesco Sarracino f.sarrac...@gmail.com wrote:
what I meant refers to the fact that I've read on an R and
S-plus companion to applied regression about methods to alter the encoding
of factors when using contrasts in regressions. These are options (for
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