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We recommend against the use of pooled predictions calculated from the multiply imputed covariates used in model derivation.
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The use of such pooled predictions generally overestimates model performance.
Alternatively, an overall performance measure may be directly calculated using the pooled predictions.
The Commissioners said they were reviewing the use of pooled funds in which it has no control over individual investments.
Among these variables can be surgical technique, clinical ability, restorative materials, the use of pooled data, and interpretation of data.
o Ongoing review of procedures and consideration of selective use of pooled funding mechanisms.
We first introduce methods for estimating imputation-specific predictions and pooled predictions, using multiply imputed covariates and using regression coefficients from a prediction model constructed on multiply imputed data (Section 1987).
We extracted imputation-specific and pooled predictions using both and to produce P4 and P5 (as defined in Table 1), respectively.
The pooled predictions were used directly to calculate the overall performance measure in our "pooled prediction" approach.
Possible imputation-specific predictions (P1, P4, and P7) and pooled predictions (P2, P3, P5, P6, P8, and P9) constructed using imputation-specific regression coefficients are defined in Table 1 and described in more detail in the subsections below.
Thus there are numerous combinations for constructing a set of predictions, including imputation-specific predictions (M predictions for each individual) and pooled predictions (an averaged prediction over imputed datasets for each individual).
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