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The US firm did not announce any difference in specifications between the aluminium, steel and gold-cased versions - there had been speculation that the higher-end editions might have more storage or allow some of their parts to be upgraded at a later point.
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Hence, it also controls for constant differences between the treatment and the control group, which is required in difference-in-differences specifications (Lechner 2010).
Before estimating difference-in-differences specifications, we present descriptive statistics that characterize our data sample as well as differences between the treatment group and the control group from ahead of the minimum wage introduction in 2014.
Below are the best prices for some popular models, but be aware retailers often sell varieties of the same machine with some differences in specification.
We test for heterogeneous treatment effects by expanding the standard difference-in-differences specification.
In conditional estimations of the difference-in-differences specification, we consider a large set of control variables.
These tests provide evidence in favour of our spline-based, difference-in trends specification.
Whether these differences are indicative of differences in relative developmental maturity or reflect some underlying difference in the specification process remains to be determined.
The possible large difference in bioavailability between originator and generic formulations developed without dissolution specifications due to relatively poor methods to control manufacturing procedures at the time became a great concern.
Due to differences in their specifications, the access technology should be considered accordingly.
For that, we take into account the differences in contract specifications and in regulatory regimes.
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