There are two missing values strategies that involve deletion or imputation. What is the most widely used approach to delete cases selectively on a variable-by-variable basis?

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Pairwise deletion is the most widely used approach for selectively deleting cases on a variable-by-variable basis, allowing the use of available data points for statistical analyses even when some data are missing for certain variables.

There Are Two Missing Values Strategies That Involve Deletion or Imputation