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...

Table A1. COD Discharges and Its Determinants with Station Fixed Effects Independent variables (1) (2) (3) (4) (5) Boundary×Post2005 -2.138** -2.012** (0.923) (0.898) Boundary ×Time_Trend -0.543*** (0.209) Proximity to Boundary ×Post2005 -0.129*** (0.044) Proximity to Boundary ×Time_Trend -0.052*** (0.011) Station dummy Yes Yes Yes Yes Yes Year dummy Yes Yes Yes Yes Yes Temperature Yes Yes Ye...

“Within” estimation of the fixed-effect stochastic frontier model does not identify parameters on time-invariant explanatory variables. If time-invariant variables are important production inputs, then standard efficiency estimates are biased. This note details bias correction, when time-invariant inputs are dummy variables. © 2006 Elsevier B.V. All rights reserved.

The objective was to analyze variations in dental arch width in relation to oral habits. Maxillary and mandibular intercanine and intermolar distance were determined in relation to certain oral habits in 1297 children (ages 3 to 6 years). After an oral examination, the parents of each child completed a questionnaire about oral habits, including the use of a dummy or a bottle (or both), finger s...

The purpose of this paper is to give a theoretical description of clockcharts, and their implementation in the StateClock tool for COSC4352 students. 1.0 Temporal logic and fair transition systems In the sequel, we use relative quantification where Q is a quantifier (e.g. ∀ or ∃), T is the type of the dummy variable x, R is the range of the dummy variable and P a predicate [Gries, 1993 #369]. F...

Two models were developed to evaluate total volume under and over-bark of Blackwood (Acacia melanoxylon R. Br.) stand trees. By variance analysis regarding volume with and without bark it was confirmed that trees age is responsible for 48 to 50% of its volumetric behaviour. Considered the averages of those variables and regarding the three homogeneous groups of the studied sites, a single model...