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Missing items and missing domain scores were extremely low, however, there is a trade-off between the low-cost mail SIS survey on the one hand and the resulting nonresponse bias on the other.
Figure 1 shows the statistical power for all methods with complete data, intermittent missing forms and drop out, and intermittent missing items and drop-out, for N =200 patients, moderate correlation (ρ = 0.7) and 20% missing data.
Analyses were first conducted with both intermittent missing forms and drop-out, and then with intermittent missing items and drop-out.
With intermittent missing items and drop-out, results were close to those with intermittent missing forms and drop out.
Photographs were substituted for the missing items and admission prices eliminated.
But in 2000, the computers were wrong more than 10percentt of the time, causing delays as workers searched for missing items and restocked spares.
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A member of the court's staff delivers the missing item and knocks.
Eleven patients (11%) had only one missing item and a further 11 (11%) patients had 2 6 missing items.
Each survey therefore had 12,000 corresponding simulated surveys containing randomly missing items, starting at 1,000 iterations with one missing item, and ending with 1,000 iterations for 12 missing items.
In subjects with missing data, scores were recalculated using the lower and the higher theoretical score for each missing item and dimensions dichotomised according to their median.
Of 262 subjects, 1 did not fill out any of the DASS items, 41 had at least one missing item, and 220 had complete data on the DASS.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com