Quade's test (non-parametric ANCOVA)

[Arash Sereshki]

Hello Stata users
I wondered if you could inform me whether STATA performs the non-parametric ANCOVA test (i.e., Quade's test). I checked non-parametric tests (https://www.stata.com/features/nonparametric-methods/), but unfortunately, I could not find Quade's test.
Thank you,

[Joseph Coveney]

I've heard that there's some kind of Python thing and so you could call that from Stata if you're so inclined.

In the meantime, you could try something like the following.

.ÿ
.ÿversionÿ17.0

.ÿ
.ÿclearÿ*

.ÿ
.ÿinputÿbyteÿgrpÿintÿyÿbyte(x1ÿx2)

ÿÿÿÿÿÿÿÿÿÿgrpÿÿÿÿÿÿÿÿÿyÿÿÿÿÿÿÿÿx1ÿÿÿÿÿÿÿÿx2
ÿÿ1.ÿÿ1ÿÿ16ÿ26ÿ12
ÿÿ2.ÿÿ1ÿÿ60ÿ10ÿ21
ÿÿ3.ÿÿ1ÿÿ82ÿ42ÿ24
ÿÿ4.ÿÿ1ÿ126ÿ49ÿ29
ÿÿ5.ÿÿ1ÿ137ÿ55ÿ34
ÿÿ6.ÿÿ2ÿÿ44ÿ21ÿ17
ÿÿ7.ÿÿ2ÿÿ67ÿ28ÿÿ2
ÿÿ8.ÿÿ2ÿÿ87ÿÿ5ÿ40
ÿÿ9.ÿÿ2ÿ100ÿ12ÿ38
ÿ10.ÿÿ2ÿ142ÿ58ÿ36
ÿ11.ÿÿ3ÿÿ17ÿÿ1ÿÿ8
ÿ12.ÿÿ3ÿÿ28ÿ19ÿÿ1
ÿ13.ÿÿ3ÿ105ÿ41ÿÿ9
ÿ14.ÿÿ3ÿ149ÿ48ÿ28
ÿ15.ÿÿ3ÿ160ÿ35ÿ16
ÿ16.ÿend

.ÿ
.ÿ*
.ÿ*ÿBeginÿhere
.ÿ*
.ÿforeachÿvarÿofÿvarlistÿyÿx?ÿ{
ÿÿ2.ÿÿÿÿÿÿÿÿÿegenÿdoubleÿ`var'_rankÿ=ÿrank(`var')
ÿÿ3.ÿ}

.ÿ
.ÿquietlyÿregressÿy_rankÿc.(x?_rank)

.ÿpredictÿdoubleÿres,ÿresiduals

.ÿ
.ÿanovaÿresÿgrp

ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿNumberÿofÿobsÿ=ÿÿÿÿÿÿÿÿÿ15ÿÿÿÿR-squaredÿÿÿÿÿ=ÿÿ0.4409
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿRootÿMSEÿÿÿÿÿÿ=ÿÿÿÿ2.30997ÿÿÿÿAdjÿR-squaredÿ=ÿÿ0.3477

ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿSourceÿ|ÿPartialÿSSÿÿÿÿÿÿÿÿÿdfÿÿÿÿÿÿÿÿÿMSÿÿÿÿÿÿÿÿFÿÿÿÿProb>F
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿ-----------+----------------------------------------------------
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿModelÿ|ÿÿÿ50.48848ÿÿÿÿÿÿÿÿÿÿ2ÿÿÿÿ25.24424ÿÿÿÿÿÿ4.73ÿÿ0.0306
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ|
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿgrpÿ|ÿÿÿ50.48848ÿÿÿÿÿÿÿÿÿÿ2ÿÿÿÿ25.24424ÿÿÿÿÿÿ4.73ÿÿ0.0306
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ|
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿResidualÿ|ÿÿÿ64.03152ÿÿÿÿÿÿÿÿÿ12ÿÿÿÿÿ5.33596ÿÿ
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿ-----------+----------------------------------------------------
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿTotalÿ|ÿÿÿÿÿ114.52ÿÿÿÿÿÿÿÿÿ14ÿÿÿÿÿÿÿÿ8.18ÿÿ

.ÿ
.ÿexit

endÿofÿdo-file


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Dataset (found on the Internet) is a transcription of Table 1 from Dana Quade, Rank Analysis of Covariance. University of North Carolina, Institute of Statistics Mimeo Series No. 483, 1966.