: Jonathan Baron ba...@psych.upenn.edu
Date: 8 March 2009 5:21:55 AM
To: Juliet Hannah juliet.han...@gmail.com
Cc: r-help@r-project.org
Subject: Re: [R] using a noisy variable in regression (not an R
question)
If you form categories, you add even more error, specifically, the
variation
Hi, This is not an R question, but I've seen opinions given on non R
topics, so I wanted
to give it a try. :)
How would one treat a variable that was measured once, but is known to
fluctuate a lot?
For example, I want to include a hormone in my regression as an
explanatory variable. However, this
If you form categories, you add even more error, specifically, the
variation in the distance between each number and the category
boundary.
What's wrong with just including it in the regression?
Yes, the measure X1 will account for less variance than the underlying
variable of real interest (T1,
Hi Juliet,
Juliet Hannah schrieb:
One simple thing to try would be to form categories
Simple but problematic. Frank Harrell put together a wonderful page
detailing all the issues with categorizing continuous data:
http://biostat.mc.vanderbilt.edu/twiki/bin/view/Main/CatContinuous
So:
Thank you for your responses.
I should have emphasized, I do not intend to categorize -- mainly
because of all the discussions I have seen on R-help arguing against
this.
I just thought it would be problematic to include the variable by
itself. Take other variables, such as a genotype or BMI. If
Hi Juliet,
Juliet Hannah schrieb:
I should have emphasized, I do not intend to categorize -- mainly
because of all the discussions I have seen on R-help arguing against
this.
Sorry that we all jumped on this ;-)
I just thought it would be problematic to include the variable by
itself. Take
On Sat, Mar 7, 2009 at 11:49 AM, Juliet Hannah juliet.han...@gmail.com wrote:
Hi, This is not an R question, but I've seen opinions given on non R
topics, so I wanted
to give it a try. :)
How would one treat a variable that was measured once, but is known to
fluctuate a lot?
For example, I
On Sat, 7 Mar 2009, Juliet Hannah wrote:
Hi, This is not an R question, but I've seen opinions given on non R
topics, so I wanted
to give it a try. :)
How would one treat a variable that was measured once, but is known to
fluctuate a lot?
For example, I want to include a hormone in my
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