The data in Table 11.10 given in Davis (2002) arise from the Iowa Cochlear Implant Project to compare the effectiveness of two types of cochlear implants in profoundly and bilaterally deaf patients. In one group of 23 subjects, the “Type A” implant was used. A second group of 21 subjects received the “Type B” implant. In both groups the electrode array was surgically implanted five to six weeks prior to electrical connection to the external speech processor. A sentence test was administered at 1, 9, 18, and 30 months after connection. The outcome variable of interest at each time point was the percentage of correct scores. Assuming normality for the outcome variable, fit a random intercept model to the data using both mean imputation and multiple imputation with five imputations to the data and compare your results. Is there any evidence of a difference between the two implant types? Investigate how the multiple imputation results change when using different numbers of imputations.
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