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Table 6 Estimates from the model for the repeated attempts

From: An exploration of the missing data mechanism in an Internet based smoking cessation trial

Parameter MAR estimate MAR standard error MNAR estimate MNAR standard error
β 1,1 (treatment) -0.099 0.081 -0.103 0.081
β 1,2 (age) 0.021 0.004 0.021 0.004
β 1,3 (sex) 0.103 0.086 0.110 0.087
β 1,4 (qualifications) 0.034 0.040 0.033 0.040
β 1,5 (deprivation) -0.026 0.043 -0.018 0.044
β 1,6 (conscientiousness) -0.009 0.050 -0.001 0.050
β 1,7 (determination) -0.002 0.055 -0.008 0.055
β 1,8 (support) 0.096 0.034 0.093 0.034
β 1,9 (dependence) 0.020 0.027 0.018 0.028
β 1,10 (previous) -0.072 0.085 -0.076 0.085
β 2 (Y) - - 0.215 0.222
  1. The model for the repeated attempts incorporates more data, and hence makes more assumptions, but provides much more satisfactory estimation of β 2, and hence the role of the outcome Y in the missing data model, than the selection model.