Sentences with phrase «issue of selection bias»

To account for the issue of selection bias and the potentially unobserved parent characteristics as the possible reason choice students appear to perform better in my first comparison, I next also accounted for the parent - related variables.

In order to circumvent the issue of selection bias in the case of mandatory retention policies like the one proposed for Michigan, recent studies have utilized a statistical approach that compares children who fall just above and just below the cutoff used to determine retention.

Not exact matches

We carefully studied issues raised by skeptics: biases from urban heating (we duplicated our results using rural data alone), from data selection (prior groups selected fewer than 20 percent of the available temperature stations; we used virtually 100 percent), from poor station quality (we separately analyzed good stations and poor ones) and from human intervention and data adjustment (our work is completely automated and hands - off).

All fair as far as it goes, although readers who want to dig into the controversies around selection bias, methodological research issues, or a final reckoning of impact will be disappointed.

Key issues identified in inland and marine presentations included the need to standardize the spatial domain, minimize double counting of emissions from lakes and wetlands, reduce bias in field site selections, improve measurements of cold season emissions, and improve scaling of hot spots.

We carefully studied issues raised by skeptics: biases from urban heating (we duplicated our results using rural data alone), from data selection (prior groups selected fewer than 20 percent of the available temperature stations; we used virtually 100 percent), from poor station quality (we separately analyzed good stations and poor ones) and from human intervention and data adjustment (our work is completely automated and hands - off).

In partnership with researchers from related projects in Canada, the UK, South Australia, the Northern Territory and Western Australia, Aboriginal organisations and policymakers, we will analyse whole - of - population data for New South Wales (NSW) to investigate the determinants of positive early childhood development in Aboriginal children, and assess the impacts of two «real - world» programmes that were implemented under circumstances where evidence of their efficacy was unable to be derived from RCTs: the NSW Aboriginal and Maternal Infant Health Service (AMIHS) 45 and the NSW Department of Family and Community Services (FACS) Brighter Futures Program.46 Early evaluations of these programmes suggested some positive changes in proximal outcomes related to their objectives.45, 47, 48 However, each of these evaluations was limited by one or more of the following: use of single data sets, less than 2 years of outcome data and / or issues of confounding and selection bias.

Another issue that might limit enthusiasm for the findings is that the majority of studies were affected by a selection bias.