period effect

period effect

An effect occurring during a clinical trial in which subjects are observed and no treatment is administered.
References in periodicals archive ?
I use a probit model to observe the period effect controlling for demographic and job characteristics and to estimate the effect of individual characteristics on the probability of separation for employed men.
A particular educational innovation leading to improved educational quality experienced by all school-age individuals would be an example of a period effect.
Similarly, as just noted, a modest portion of the decline in social capital during the 1980s appears to be a period effect.
We learned that we could do so without sacrificing much model fit by using only one period effect and dropping the second-order effect of lagged foundings.
The period effect is so successful that visitors are often surprised to learn that the house is not a remodel.
In addition, the Company is providing supplemental pro forma results of operations for the 16 weeks ended May 1, 2007 that reflect the current period effect of certain purchase accounting adjustments related to its acquisition of Jamba Juice Company in November 2006 and adjustments related to the adoption of SFAS 123(R), Share-Based Payment, to give relevant comparative financial results with the similar prior year period.
It is important to emphasize that the null hypothesis for the AC model was no period effect on mortality rates and that of the AP model, no birth cohort effect.
The basic purpose of this type of study is to separate the treatment effect from the period effect (Welleck & Blettner, 2012).
An appreciable period effect is also observed, with peak rates that overlap for the cohorts born between 1950 and 1969.
It is concluded for an initial period effect from the date of notification for a period of 12 months.
ijk] is the dependent variable, [mu] is the global mean, T is the treatment effect, P is the period effect, A is the animal effect, and [[epsilon].
As with the regressions based on all observations, the period effect is both positive and statistically important for the subsample representing advance purchase passengers.