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

Table 2 The root mean squared differences.

	Cold deck	1st run hot deck	2nd run hot deck	Mean 5 runs hot deck	Items never offered
1st run hot deck	0.5462
2nd run hot deck	0.5712	0.0518
Mean 5 runs hot deck	0.5493	0.0280	0.0396
Items never offered	0.5317	0.0358	0.0496	0.0249
Tendency to respond	0.5316	0.0351	0.0494	0.0242	0.0020

The root mean squared differences. Using the root mean squared difference to compare the estimates of item parameters obtained in the different procedures. 'Cold deck' denotes cold deck imputation, '1st hot deck' and '2nd hot deck' the first and second runs of the hot deck imputation procedure, respectively, 'Mean hot deck' the mean of all 5 runs of the hot deck imputation procedure, 'Never offered' the procedure treating 'not applicable' responses as if the item had never been offered to the patient and 'Tendency' the model taking account of the tendency to respond to items'.

ISSN: 1477-7525