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Fig. 2 | BMC Medical Research Methodology

Fig. 2

From: Multiple imputation methods for handling missing values in a longitudinal categorical variable with restrictions on transitions over time: a simulation study

Fig. 2

a) Scenarios to be imputed under stage 1 of the restriction process (never-smoker); b) Scenarios to be imputed under stage 2 of the restriction process (ex- or current-smoker); c) Scenarios to be imputed under stage 3 of the restriction process (never-, ex- or current-smoker); Grey boxes refer to data to be imputed at each stage if incomplete

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