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. Author manuscript; available in PMC: 2023 Nov 28.
Published in final edited form as: J Biomed Inform. 2023 Jan 27;139:104295. doi: 10.1016/j.jbi.2023.104295

Table 2:

The notation used in the paper.

Parameter Name Meaning
N number of cases (sample points)
d number of predictors
XR Nxd a dataset containing N cases, each described by d predictors
qi,vari,sei,cii the estimate (its variance, standard error, and confidence interval) computed on XR Nxd by a statistical estimator for the ith predictor variable foreachi1,...,d.
Q=qi,
VAR=vari,
SE=sei,
CI=cii,
for each i1,...,d
The vector of all the estimates (their variance, standard error, and confidence interval) computed over all the predictors in a dataset XR Nxd
m number of multiple imputations
X(j)^R Nxd The j-th imputed set
qi(j)^,vari(j)^,sei(j)^,cii(j)^
for each i1,...,d
the estimate (its variance, standard error, and confidence interval) for the ith predictor i1,...,d of the the j-th imputed set X(j)^R Nxd
Q(j)^=qi(j)^
VAR(j)^=vari(j)^
SE(j)^=sei(j)^
CI(j)^=cii(j)^ for each i1,...,d
The vector of all the estimates (their variance, standard error, and confidence interval) computed over all the predictors in the the j-th imputed set X(j)^R Nxd.
qi^,vari^,sei^,cii^
for each i1,...,d
the pooled estimate (its variance, standard error, and confidence interval) obtained by an MI strategy for the ith predictor variable in XR Nxd by applying Rubin’s rule (Rubin et al 1987).
Q^=1mj=1mQ(j)^=qi^,
for each i{1,...,d}
The vector of the pooled estimates (one estimate per predictor variable) computed by an MI imputation strategy using m imputations
W^=1mj=1mVAR(j)^W
W^=Wi^, for each i{1,...,d}
W^ is the vector of within imputation variances obtained with m imputations (one within imputation variance per predictor variable).
W^ is an estimate of W, the true within imputation variance when m
B^=1m-1j=1mQ(j)^-Q^2B
B^=Bi^, for each i{1,...,d}
B^ is the vector of between imputation variances obtained with m imputations (one within imputation variance per predictor variable).
B^ is an estimate of B, the true between imputation variance when m
T^=W^+(1+1m)B^T T^ is the total variance that estimates the true total variance, T when m
A The number of amputations of the complete dataset
Q_=1Aa=1AQ(a)^=qi_EQ^ for each i{1,...,d} The vector with the averages of the MI estimates across all the amputations, that approximates the (vector of) expected values of the MI estimates for each predictor