Noun
regressor (plural regressors)
That which regresses, or causes regression.
Factors other than the potential causative variable of interest are controlled for by including them as regressors in addition to the regressor representing the variable of interest. Source: Internet
The small amount of local spatial autocorrelation that was found suggests a few clusters of high and low literacy rates amongst municipios in Veracruz but not enough to warrant including an I-statistic as a regressor. Source: Internet