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 ?
520 million with two years completion period effect from May 01, 2003 (to April 30, 2005).
Thus, as variations in the changes of patterns of BMI trajectories with aging across individuals could be ascribed to lifestyle, social and other biological factors, (36-38) a period effect could also play a significant role in the differential of BMI at diagnosis during the recent two decades.
Since cohort = age -3 x I (year = 2004), it is evident that the period effect (p), cohort effects (c), and age effects (a) are not separately identified.
The period effect is apparent as decreasing PCB-153 concentrations across the sampling years and as subjects aged (Figure 4A,B).
Tim Ash of Standard Bank points out that the "very high base period effect from last year's devaluation-inspired spike in inflation to 12-13% was always going to crash inflation lower, and this seems to be the case.
down year-on-year, due to the fact mentioned above associated with the aging period effect of new routes which started on December 15, 2012.
When an interaction was observed between main effects, the period effect was further separated using the TUKEY adjustment.
Sample size for two period AB/BA study deign and its appropriate analysis considering period effect and treatment effect for both parametric and non-parametric situation are described.