Donner, Allan, The Relative Effectiveness of Procedures Commonly Used in Multiple Regression Analysis for Dealing with Missing Values, American statistician , 36(4), 1982, pp. 378-381
Expressions are derived for the bias and variance associated with procedures frequently used to estimate partial regression coefficients in a linear model having the two explanatory variables x 1 and x 2, with missing values on x 2 only.The expressions are used to help gain insight into the relative effectiveness of these procedures for handling more complex patterns of missing data.