Error running regression using factor variable

[Robbie Mueffelmann]

Hi all,

I'm running a regression on a model which only includes explanatory variables that are dummy variables for string data. I encoded these string data and had no issue. When I try to run a regression or pwcorr using a single factor variable for the dummy variables of each category I am given an error stating that "factor variable operators not allowed" From other forum posts and online resources I was under the impression I should be able to do so. This is an issue for me because there are approximately 65 dummy variables so running a regression or (especially) pwcorr generates a very large amount of data.

edit: I can successfully run both reg and pwcorr including all the dummy variables in the command, but I'm looking for a way to clean my data up a bit.

I'd appreciate any input or direction you're willing to offer.

Thanks!

[Richard Williams]

Welcome to Statalist.

Please show your commands and how Stata responds so we can see exactly what you are doing.

[Robbie Mueffelmann]

Welcome to Statalist.

Please show your commands and how Stata responds so we can see exactly what you are doing.

I was testing out the factor variable of my dummy variables for 51 states.

The encoded version of these string data is state_n

I was testing it by running the regression using only this explanatory variable and my dependent variable exp_loss which is numeric.

reg exp_loss i.state_n
factor-variable operators not allowed
r(101);

Let me know if you need to know anything else! Thanks!

[Joseph Coveney]

Let me know if you need to know anything else!

.ÿ
.ÿversionÿ17.0

.ÿ
.ÿclearÿ*

.ÿ
.ÿ//ÿseedem
.ÿsetÿseedÿ1484524562

.ÿ
.ÿ/*ÿIÿwasÿtestingÿoutÿtheÿfactorÿvariableÿofÿmyÿdummyÿvariablesÿforÿ51ÿstates.ÿ*/
.ÿimportÿdelimitedÿusingÿ///
>ÿÿÿÿÿÿÿÿÿ"https://github.com/jasonong/List-of-US-States/raw/master/states.csv",ÿ///
>ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿvarnames(1)
(encodingÿautomaticallyÿselected:ÿISO-8859-1)
(2ÿvars,ÿ51ÿobs)

.ÿ
.ÿ/*ÿTheÿencodedÿversionÿofÿtheseÿstringÿdataÿisÿstate_nÿ*/
.ÿencodeÿstate,ÿgenerate(state_n)

.ÿ
.ÿquietlyÿexpandÿ20

.ÿ
.ÿ/*ÿmyÿdependentÿvariableÿexp_lossÿwhichÿisÿnumeric.ÿ*/
.ÿgenerateÿdoubleÿexp_lossÿ=ÿrnormal()

.ÿ
.ÿ/*ÿIÿwasÿtestingÿitÿbyÿrunningÿtheÿregressionÿusingÿonlyÿthisÿexplanatoryÿvariableÿ*/
.ÿregÿexp_lossÿi.state_n

ÿÿÿÿÿÿSourceÿ|ÿÿÿÿÿÿÿSSÿÿÿÿÿÿÿÿÿÿÿdfÿÿÿÿÿÿÿMSÿÿÿÿÿÿNumberÿofÿobsÿÿÿ=ÿÿÿÿÿ1,020
-------------+----------------------------------ÿÿÿF(50,ÿ969)ÿÿÿÿÿÿ=ÿÿÿÿÿÿ1.11
ÿÿÿÿÿÿÿModelÿ|ÿÿ51.0664633ÿÿÿÿÿÿÿÿ50ÿÿ1.02132927ÿÿÿProbÿ>ÿFÿÿÿÿÿÿÿÿ=ÿÿÿÿ0.2891
ÿÿÿÿResidualÿ|ÿÿ895.483462ÿÿÿÿÿÿÿ969ÿÿÿ.92413154ÿÿÿR-squaredÿÿÿÿÿÿÿ=ÿÿÿÿ0.0540
-------------+----------------------------------ÿÿÿAdjÿR-squaredÿÿÿ=ÿÿÿÿ0.0051
ÿÿÿÿÿÿÿTotalÿ|ÿÿ946.549925ÿÿÿÿÿ1,019ÿÿÿ.92890081ÿÿÿRootÿMSEÿÿÿÿÿÿÿÿ=ÿÿÿÿ.96132

---------------------------------------------------------------------------------------
ÿÿÿÿÿÿÿÿÿÿÿÿÿexp_lossÿ|ÿCoefficientÿÿStd.ÿerr.ÿÿÿÿÿÿtÿÿÿÿP>|t|ÿÿÿÿÿ[95%ÿconf.ÿinterval]
----------------------+----------------------------------------------------------------
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿstate_nÿ|
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ÿÿÿÿÿÿÿÿÿÿÿÿArkansasÿÿ|ÿÿ-.1761145ÿÿÿ.3039953ÿÿÿÿ-0.58ÿÿÿ0.562ÿÿÿÿ-.7726796ÿÿÿÿ.4204505
ÿÿÿÿÿÿÿÿÿÿCaliforniaÿÿ|ÿÿÿ.1552467ÿÿÿ.3039953ÿÿÿÿÿ0.51ÿÿÿ0.610ÿÿÿÿ-.4413183ÿÿÿÿ.7518117
ÿÿÿÿÿÿÿÿÿÿÿÿColoradoÿÿ|ÿÿÿ.3725452ÿÿÿ.3039953ÿÿÿÿÿ1.23ÿÿÿ0.221ÿÿÿÿ-.2240198ÿÿÿÿ.9691103
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DistrictÿofÿColumbiaÿÿ|ÿÿÿ.0281422ÿÿÿ.3039953ÿÿÿÿÿ0.09ÿÿÿ0.926ÿÿÿÿ-.5684228ÿÿÿÿ.6247072
ÿÿÿÿÿÿÿÿÿÿÿÿÿFloridaÿÿ|ÿÿÿ.1380592ÿÿÿ.3039953ÿÿÿÿÿ0.45ÿÿÿ0.650ÿÿÿÿ-.4585058ÿÿÿÿ.7346242
ÿÿÿÿÿÿÿÿÿÿÿÿÿGeorgiaÿÿ|ÿÿÿ.5651121ÿÿÿ.3039953ÿÿÿÿÿ1.86ÿÿÿ0.063ÿÿÿÿ-.0314529ÿÿÿÿ1.161677
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿHawaiiÿÿ|ÿÿ-.1275363ÿÿÿ.3039953ÿÿÿÿ-0.42ÿÿÿ0.675ÿÿÿÿ-.7241013ÿÿÿÿ.4690287
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ÿÿÿÿÿÿÿÿÿÿÿÿÿÿKansasÿÿ|ÿÿÿ.3719241ÿÿÿ.3039953ÿÿÿÿÿ1.22ÿÿÿ0.221ÿÿÿÿ-.2246409ÿÿÿÿ.9684892
ÿÿÿÿÿÿÿÿÿÿÿÿKentuckyÿÿ|ÿÿ-.0312899ÿÿÿ.3039953ÿÿÿÿ-0.10ÿÿÿ0.918ÿÿÿÿ-.6278549ÿÿÿÿ.5652751
ÿÿÿÿÿÿÿÿÿÿÿLouisianaÿÿ|ÿÿ-.2038539ÿÿÿ.3039953ÿÿÿÿ-0.67ÿÿÿ0.503ÿÿÿÿ-.8004189ÿÿÿÿ.3927111
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿMaineÿÿ|ÿÿ-.1106135ÿÿÿ.3039953ÿÿÿÿ-0.36ÿÿÿ0.716ÿÿÿÿ-.7071785ÿÿÿÿ.4859516
ÿÿÿÿÿÿÿÿÿÿÿÿMarylandÿÿ|ÿÿ-.2196806ÿÿÿ.3039953ÿÿÿÿ-0.72ÿÿÿ0.470ÿÿÿÿ-.8162456ÿÿÿÿ.3768844
ÿÿÿÿÿÿÿMassachusettsÿÿ|ÿÿÿ-.184796ÿÿÿ.3039953ÿÿÿÿ-0.61ÿÿÿ0.543ÿÿÿÿÿ-.781361ÿÿÿÿÿ.411769
ÿÿÿÿÿÿÿÿÿÿÿÿMichiganÿÿ|ÿÿ-.0267228ÿÿÿ.3039953ÿÿÿÿ-0.09ÿÿÿ0.930ÿÿÿÿ-.6232878ÿÿÿÿ.5698422
ÿÿÿÿÿÿÿÿÿÿÿMinnesotaÿÿ|ÿÿÿ.0612812ÿÿÿ.3039953ÿÿÿÿÿ0.20ÿÿÿ0.840ÿÿÿÿ-.5352838ÿÿÿÿ.6578462
ÿÿÿÿÿÿÿÿÿMississippiÿÿ|ÿÿÿ.2070535ÿÿÿ.3039953ÿÿÿÿÿ0.68ÿÿÿ0.496ÿÿÿÿ-.3895115ÿÿÿÿ.8036185
ÿÿÿÿÿÿÿÿÿÿÿÿMissouriÿÿ|ÿÿ-.1522864ÿÿÿ.3039953ÿÿÿÿ-0.50ÿÿÿ0.617ÿÿÿÿ-.7488515ÿÿÿÿ.4442786
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ÿÿÿÿÿÿÿÿÿÿNewÿJerseyÿÿ|ÿÿÿ.2574188ÿÿÿ.3039953ÿÿÿÿÿ0.85ÿÿÿ0.397ÿÿÿÿ-.3391463ÿÿÿÿ.8539838
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ÿÿÿÿÿÿÿÿRhodeÿIslandÿÿ|ÿÿÿ.1812171ÿÿÿ.3039953ÿÿÿÿÿ0.60ÿÿÿ0.551ÿÿÿÿ-.4153479ÿÿÿÿ.7777821
ÿÿÿÿÿÿSouthÿCarolinaÿÿ|ÿÿ-.0489869ÿÿÿ.3039953ÿÿÿÿ-0.16ÿÿÿ0.872ÿÿÿÿ-.6455519ÿÿÿÿ.5475781
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ÿÿÿÿÿÿÿÿÿÿÿÿÿWyomingÿÿ|ÿÿ-.0059663ÿÿÿ.3039953ÿÿÿÿ-0.02ÿÿÿ0.984ÿÿÿÿ-.6025313ÿÿÿÿ.5905987
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ|
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ_consÿ|ÿÿÿÿ.008053ÿÿÿ.2149572ÿÿÿÿÿ0.04ÿÿÿ0.970ÿÿÿÿ-.4137822ÿÿÿÿ.4298882
---------------------------------------------------------------------------------------

.ÿ
.ÿexit

endÿofÿdo-file


.

[Robbie Mueffelmann]

.ÿ
.ÿversionÿ17.0

.ÿ
.ÿclearÿ*

.ÿ
.ÿ//ÿseedem
.ÿsetÿseedÿ1484524562

.ÿ
.ÿ/*ÿIÿwasÿtestingÿoutÿtheÿfactorÿvariableÿofÿmyÿdummyÿvariablesÿforÿ51ÿstates.ÿ*/
.ÿimportÿdelimitedÿusingÿ///
>ÿÿÿÿÿÿÿÿÿ"https://github.com/jasonong/List-of-US-States/raw/master/states.csv",ÿ///
>ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿvarnames(1)
(encodingÿautomaticallyÿselected:ÿISO-8859-1)
(2ÿvars,ÿ51ÿobs)

.ÿ
.ÿ/*ÿTheÿencodedÿversionÿofÿtheseÿstringÿdataÿisÿstate_nÿ*/
.ÿencodeÿstate,ÿgenerate(state_n)

.ÿ
.ÿquietlyÿexpandÿ20

.ÿ
.ÿ/*ÿmyÿdependentÿvariableÿexp_lossÿwhichÿisÿnumeric.ÿ*/
.ÿgenerateÿdoubleÿexp_lossÿ=ÿrnormal()

.ÿ
.ÿ/*ÿIÿwasÿtestingÿitÿbyÿrunningÿtheÿregressionÿusingÿonlyÿthisÿexplanatoryÿvariableÿ*/
.ÿregÿexp_lossÿi.state_n

ÿÿÿÿÿÿSourceÿ|ÿÿÿÿÿÿÿSSÿÿÿÿÿÿÿÿÿÿÿdfÿÿÿÿÿÿÿMSÿÿÿÿÿÿNumberÿofÿobsÿÿÿ=ÿÿÿÿÿ1,020
-------------+----------------------------------ÿÿÿF(50,ÿ969)ÿÿÿÿÿÿ=ÿÿÿÿÿÿ1.11
ÿÿÿÿÿÿÿModelÿ|ÿÿ51.0664633ÿÿÿÿÿÿÿÿ50ÿÿ1.02132927ÿÿÿProbÿ>ÿFÿÿÿÿÿÿÿÿ=ÿÿÿÿ0.2891
ÿÿÿÿResidualÿ|ÿÿ895.483462ÿÿÿÿÿÿÿ969ÿÿÿ.92413154ÿÿÿR-squaredÿÿÿÿÿÿÿ=ÿÿÿÿ0.0540
-------------+----------------------------------ÿÿÿAdjÿR-squaredÿÿÿ=ÿÿÿÿ0.0051
ÿÿÿÿÿÿÿTotalÿ|ÿÿ946.549925ÿÿÿÿÿ1,019ÿÿÿ.92890081ÿÿÿRootÿMSEÿÿÿÿÿÿÿÿ=ÿÿÿÿ.96132

---------------------------------------------------------------------------------------
ÿÿÿÿÿÿÿÿÿÿÿÿÿexp_lossÿ|ÿCoefficientÿÿStd.ÿerr.ÿÿÿÿÿÿtÿÿÿÿP>|t|ÿÿÿÿÿ[95%ÿconf.ÿinterval]
----------------------+----------------------------------------------------------------
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿstate_nÿ|
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿAlaskaÿÿ|ÿÿ-.0269382ÿÿÿ.3039953ÿÿÿÿ-0.09ÿÿÿ0.929ÿÿÿÿ-.6235033ÿÿÿÿ.5696268
ÿÿÿÿÿÿÿÿÿÿÿÿÿArizonaÿÿ|ÿÿ-.4038219ÿÿÿ.3039953ÿÿÿÿ-1.33ÿÿÿ0.184ÿÿÿÿ-1.000387ÿÿÿÿ.1927431
ÿÿÿÿÿÿÿÿÿÿÿÿArkansasÿÿ|ÿÿ-.1761145ÿÿÿ.3039953ÿÿÿÿ-0.58ÿÿÿ0.562ÿÿÿÿ-.7726796ÿÿÿÿ.4204505
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.ÿexit

endÿofÿdo-file


.

Thank you for the response! I figured it out and got the same results. The issue I was running into is that the state string variables were two-letter state abbreviations so they were encoded improperly as the encode command does so alphabetically. I renamed these variables to the actual state like you have in your data and running the regression worked with the newly defined/encoded state_n.

Thanks again!