Sentences with phrase «null effect»

Such approaches have yielded some success among young children, but a meta - analysis showed null effects for adolescents (3).
According to the Coalition for Evidence - Based Policy, the vast majority of the education experiments that have been conducted over the past decade have yielded null effects on student outcomes.
After doing so, you can quickly prepare everyone against the attack by ordering them to gather around, putting up shields and other various defences to null the effects of the once deadly strike.
Had she not done so in this study, she would have reported a null effect on affect when in fact women benefitted significantly.
And the claim typically persists for decades once widely - cited, despite the best efforts of serious investigators to critique weak methodologies and flawed interpretation, or even robust demonstrations of a null effect in healthy animals (as the two independent demonstrations that resveratrol does not extend lifespan in nonobese, wild - type mice over a wide range of doses).»
Suppose you were a young adult male, who is highly athletic (exercises every day), has well diversified diet of fruits and vegetables (still eating meat though), would such a lifestyle have a nulling effect if that person were to also smoke cigars every week?
When we examine effects for subgroups of advantaged students, we typically find much smaller or null effects.
Importantly, our null effect estimates from the random experiment differ substantially from those found from an analysis of CPS data, raising concerns about the potential for selection bias in non-experimental estimates of returns.
Estimates from regressions with detailed controls, nearest - neighbor models, and propensity score models all indicate large, positive, and statistically significant relationships between computer ownership and earnings and employment, in sharp contrast to the null effects of our experiment.
We speculate that district support also played an important role in explaining the large positive effect for Cohort 1 and the null effect for Cohort 2.
Girls» basketball also remains positive and statistically significant (at p < 0.10), but boys» basketball is not statistically distinguishable from a null effect.
Again, they found some negative effects and — at best — some null effects:
The study replicates the null effect from an earlier, smaller and thus underpowered trial.2 It is possible that such interventions need to be delivered over a longer period to reduce vascular and other metabolic risk factors to depression.5 - 7
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