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Re: st: Change of reference group in linear multiple regression analysis
From
Richard Williams <[email protected]>
To
[email protected], [email protected]
Subject
Re: st: Change of reference group in linear multiple regression analysis
Date
Thu, 09 Aug 2012 10:39:12 -0500
At 08:38 AM 8/9/2012, Nick Cox wrote:
Why not -recode- to say 1, 4, 8, 15, 25, 40 and use the quantitative
information you have? Sure, there is some arbitrariness involved, but
it is defensible.
I've done this myself. But does anybody know of any literature that
defends (or attacks) the practice? It seems like the most difficult
part is the open-ended upper category -- how should you choose a
value for that?
Nick
On Thu, Aug 9, 2012 at 2:30 PM, Richard Goldstein
<[email protected]> wrote:
> I assume you are using an up-to-date version of Stata; see -h fvvarlist-
> and look under "base level"
On 8/9/12 9:25 AM, Amal Khanolkar wrote:
>> Hi, I'm currently running a linear multiple regression analysis
where the principle explanatory variable is:
>>
>> Years since |
>> immigration | Freq. Percent Cum.
>> ------------+-----------------------------------
>> <3 yrs | 106,794 3.57 3.57
>> 3-5 yrs | 91,311 3.05 6.62
>> 6-10 yrs | 96,657 3.23 9.85
>> 11-19 yrs | 82,344 2.75 12.61
>> 20-29 yrs | 50,954 1.70 14.31
>> >=30 yrs | 2,563,396 85.69 100.00
>> ------------+-----------------------------------
>> Total | 2,991,456 100.00
>>
>> - Currently the default group is the first category, <3yrs. I
would however like to change this in the regression to the last
group >=30 years. How do I do this without having to recode the above variable?
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-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
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