FICO is an outbound statistic defined by the fraction of incomplete cases
among cases with `Yj`

observed (White and Carlin, 2010).

## Arguments

- data
A data frame or a matrix containing the incomplete data. Missing values are coded as NA's.

## References

Van Buuren, S. (2018).
*Flexible Imputation of Missing Data. Second Edition.*
Chapman & Hall/CRC. Boca Raton, FL.

White, I.R., Carlin, J.B. (2010). Bias and efficiency of multiple imputation
compared with complete-case analysis for missing covariate values.
*Statistics in Medicine*, *29*, 2920-2931.