Description Usage Arguments Details Value See Also Examples
The values below the detection limit for each chemical are substituted by its detection limit/sqrt(2).
1 | impute.sub(X, DL, verbose = FALSE)
|
X |
A numeric vector, matrix, or data-frame of chemical concentration levels with n subjects and C chemicals to be imputed. Missing values are indicated by NA's. Ideally, a numeric matrix. |
DL |
The detection limit for each chemical as a numeric vector with length equal to C chemicals. Vector must be complete (no NA's); any chemical that has a missing detection limit is not imputed. If DL is a data-frame or matrix with 1 row or 1 column, it is forced as a numeric vector. |
verbose |
Logical; if TRUE, prints more information. Useful to check for any errors in the code. Default: FALSE. |
A n x C matrix of components X are interval-censored between zero and different detection limits DL. Although X may refer to a variable with no obvious DL, we consider each chemical concentration being partially observed in mixture X.
A n x C matrix where the BDL values of each chemical are substituted by its detection limit/sqrt(2).
Other imputation:
impute.Lubin()
,
impute.boot()
,
impute.multivariate.bayesian()
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