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Table 3 The root mean squared differences.

From: Practical methods for dealing with 'not applicable' item responses in the AMC Linear Disability Score project

Procedure used to deal with NA responses Mean Standard deviation 95% Confidence interval for mean
Cold deck imputation 1.17 1.21 (1.05, 1.29)
Hot deck imputation 1.67 1.57 (1.52, 1.83)
Treating 'NA' as if the items had never been presented 1.65 1.52 (1.50, 1.80)
  1. The root mean squared differences. Estimates of the mean and standard deviation of the functional status obtained using the a variety of procedures to estimate the functional status for the individual patients and the measurement characteristics of the items.