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) |