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29... : G Azar, B. (2002). Finding a solution for missing data. Monitor on Psychology, 33 (7), 70. Bhaskaran, K.; & Smeeth, L. (2014). What is the difference between missing completely at random and missing at random? International Journal of Epidemiology, 43 (4), 1336-1339. Bodner, T. E. (2006). Missing data: Prevalence and reporting practices. Psychological Reports, 99, 675 680. Cao, W.; Tsiatis, A. A.; & Davidian, M. (2009). Improving efficiency and robustness of the doubly robust estimator for a population mean with incomplete data. Biometrika, 96, 723-734. Dillman, D. A.; Eltinge, J. L.; Groves, R. M.; & Little, R. J. (2002). Survey nonresponse in design, data collection, and analysis. Survey nonresponse, 3-26. Enders, C. K. (2003). Using the expectation maximization algorithm to estimate coefficient alpha for scales with item-level missing data. Psychological methods, 8 (3), 322. Fowler Jr, F. J. (2013). Survey research methods. Sage publications. Graham, J. W.; & Coffman, D. L. (2012). Structural equation modeling with missing data. Handbook of structural equation modeling, 277-295. Groves, R. M.; & Couper, M. P. (2012). Nonresponse in household interview surveys. John Wiley & Sons. Groves, R. M.; Fowler Jr, F. J.; Couper, M. P.; Lepkowski, J. M.; Singer, E.; & Tourangeau, R. (2011). Survey methodology (Vol. 561). John Wiley & Sons. Hox, J.; De Leeuw, E. D.; Couper, M. P.; Groves, R. M.; De Heer, W.; Kuusela, V.; & Belak, E. (2002). The influence of interviewers attitude and behaviour on household survey nonresponse: An international comparison. In: R. M. Groves, D. A. Dillman, J. L. Eltinge, & R.J.A. Little (Eds). Survey nonresponse. New York: Wiley, pp. 103-120 Knol, M. J.; Janssen, K. J.; Donders, A. R. T.; Egberts, A. C.; Heerdink, E. R.; Grobbee, D. E.;... & Geerlings, M. I. (2010). Unpredictable bias when using the missing indicator method or complete case analysis for missing confounder values: an empirical example. Journal of Clinical Epidemiology, 63 (7), 728-736.

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