On regression modelling with dummy variables versus separate regressions per group: Comment on Holgerssonet al.
نویسندگان
چکیده
منابع مشابه
Tests of Inference for Dummy Variables in Regressions with Logarithmic Transformed Dependent Variables
The interpretation of dummy variables in regressions where the dependent variable is subject to a log transformation has been of continuing interest in economics. However, in the main, these earlier papers do not deal with the inferential aspects of the parameters estimated. In this paper we compare the inference implied by the hypotheses tested on the linear parameter estimated in the model an...
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Researchers in education and the social sciences make extensive use of linear regression models in which the dependent variable is continuous-valued while the explanatory variables are a combination of continuous-valued regressors and dummy variables. The dummies partition the sample into groups, some of which may contain only a few observations. Such groups may easily include enough outliers t...
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A method is given for obtaining equivalence subgroups of a family of differential equations from the equivalence group of simpler equations of a similar form, but in which the arbitrary functions specifying the family element depend on fewer variables. Examples of applications to classical equations are presented, some of which show how the method can actually be used for a much easier determin...
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Time and brand dummy variables are typically used as controls for omitted variables. The operating assumption made is that time dummies control for unobserved factors affecting price and brand dummies control for unobserved factors affecting quality. We investigate the validity of the latter assumption by explicitly controlling for supply and demand factors in hedonic regressions for stereo rec...
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ژورنال
عنوان ژورنال: Journal of Applied Statistics
سال: 2015
ISSN: 0266-4763,1360-0532
DOI: 10.1080/02664763.2015.1077371