选择的control组不能代表产生结果的人群时,产生selection bias。(比如研究某个疾病,则只从医院选择人群,但是医院的人可能本身存在很多其他问题,也与自变量相关,就会低估它于目标变量间的关系);可以通过选择多个不同渠道的用户作为control(比如病房+小区) selection bias in cohort studies cohort studies:也是一种研究变量...
Selection bias and patterns of confounding in cohort studies: the case of the NINFEA web-based birth cohort. J Epidemiol Community Health. 2012;66:976-81.Pizzi C, De Stavola BL, Pearce N, Lazzarato F, Ghiotti P, Merletti F, et al. Selection bias and patterns of confounding in cohort ...
选择的control组不能代表产生结果的人群时,产生selection bias。(比如研究某个疾病,则只从医院选择人群,但是医院的人可能本身存在很多其他问题,也与自变量相关,就会低估它于目标变量间的关系);可以通过选择多个不同渠道的用户作为control(比如病房+小区) selection bias in cohort studies cohort studies:也是一种研究变量...
In cohort studies:In cohort studies, the selection of the exposed and unexposed groups takes place before the outcome of interest is developed, hence selection bias is less likely to occur. Nonetheless, bias may occur if there is variation in the follow-up or identification of cases across dif...
the case-parental control design addresses the problem of confounding of gene effects by ethnicity or population stratifi- cation; and cohort studies can address the problem of disease bias because biologic samples and questionnaire data are... M Garcia-Closas,SE Hankinson,S.-m. Ho,... - 《...
Although adjustment can correct for confounding by indication to some extent, the resulting estimates are still prone to healthy vaccinee bias, at least as long as unspecific outcomes like all-cause mortality are used. Therefore, cohort studies using administrative data bases with unspecific outcomes ...
In the epidemiologic study of end-stage renal disease (ESRD), accurate adjustment for comorbidity is essential to controlling bias in the comparison of outcomes across groups of patients or dialysis facilities. Liu et al. derive and validate a novel comorbidity index using data from the United Sta...
Minimizing Bias Due to Confounding by Indication in Comparative Effectiveness Research: The Importance of Restriction Health care reform has invigorated the genre of comparative effectiveness. With new congressional funding to identify which clinical strategies may work be......
Re: Does Exposure Prediction Bias Health-effect Estimation? The Relationship Between Confounding Adjustment and Exposure Prediction. Little is known about environmental factors that may increase the risk of prostate cancer. We estimated associations between incident prostate cancer and e... MS Goldberg,P...
BiasDesign of experimentsDiscusses the problem of confounding in cohort studies. How confounding and selection bias can be minimized to ensure valid outcomes comparison; The two characteristic criteria that defines a confounder; Identifying and assessing potential known and unknown confounders; The reason ...