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      Quest for Significance and Violent Extremism: The Case of Domestic Radicalization : Quest for Significance and Violent Extremism

      , ,
      Political Psychology
      Wiley-Blackwell

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          Using the outcome for imputation of missing predictor values was preferred.

          Epidemiologic studies commonly estimate associations between predictors (risk factors) and outcome. Most software automatically exclude subjects with missing values. This commonly causes bias because missing values seldom occur completely at random (MCAR) but rather selectively based on other (observed) variables, missing at random (MAR). Multiple imputation (MI) of missing predictor values using all observed information including outcome is advocated to deal with selective missing values. This seems a self-fulfilling prophecy. We tested this hypothesis using data from a study on diagnosis of pulmonary embolism. We selected five predictors of pulmonary embolism without missing values. Their regression coefficients and standard errors (SEs) estimated from the original sample were considered as "true" values. We assigned missing values to these predictors--both MCAR and MAR--and repeated this 1,000 times using simulations. Per simulation we multiple imputed the missing values without and with the outcome, and compared the regression coefficients and SEs to the truth. Regression coefficients based on MI including outcome were close to the truth. MI without outcome yielded very biased--underestimated--coefficients. SEs and coverage of the 90% confidence intervals were not different between MI with and without outcome. Results were the same for MCAR and MAR. For all types of missing values, imputation of missing predictor values using the outcome is preferred over imputation without outcome and is no self-fulfilling prophecy.
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            Understanding Terror Networks

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              Group polarization: A critical review and meta-analysis.

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                Author and article information

                Journal
                Political Psychology
                Political Psychology
                Wiley-Blackwell
                0162895X
                October 2017
                October 28 2017
                : 38
                : 5
                : 815-831
                Article
                10.1111/pops.12376
                d095603a-0bf0-429f-b65b-e0e426d85f74
                © 2017

                http://doi.wiley.com/10.1002/tdm_license_1.1

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