Advised missing data method

Longitudinal analysis > Missings in predictor/covariate > MNAR > >50% missing data

In this situation none of the methods that are discussed on this website are advised. Several papers are available on methods that are developed to handle MNAR data (Enders 2011; Molenberghs et al. 2003). However, with this large percentage of subjects with missing values with a MNAR mechanism, it might not be wise to analyse the data.