Sentence examples for by an imputation model from inspiring English sources

During time periods when parameters needed in the risk equation are missing for an individual, the parameters are filled by an imputation model using group level information or interpolation.

Because the ICE approach involves a series of univariate models rather than a single large model, the MICE approach imputes data on a variable by variable basis by specifying an imputation model per variable.

Multiple Imputation (MI) begins by imputing values for the missing data multiple times by sampling from an imputation model (using either chained equations [ 17, 18] or a multivariate normal model [ 19]).

MI begins by replacing the missing data with plausible values by sampling multiple times from an imputation model; thus, multiple completed (observed plus imputed) datasets are created.

In MI, missing data are replaced by data drawn from an imputation model.

Briefly, we proposed a 3-step strategy: – Fit an imputation model assuming ignorable MVs; – Modify the imputation model by adding a parameter (expressed as the odds ratio comparing the odds of a response category among subjects with MV with those without MV for categorical variables; as the difference in expected values for continuous variables); – Impute MVs under the scenario thus specified.

MVs were imputed by using the MICE (Multivariate Imputation by Chained Equations) algorithm and R package [ 18], which allows for building up an imputation model with mixed-type covariates.

The second step is the single imputation of missing values in background variables which requires an imputation model.

Multiple imputation thus requires the building of an imputation model in which predictor variables have to be specified.

This violated the assumption made by the imputation model implemented in Amelia II, which optimally requires multivariate normally distributed data.

The survival estimates provided by our imputation model were in agreement with the true cause-specific survival.