Skip to main content
. Author manuscript; available in PMC: 2010 Apr 15.
Published in final edited form as: J Data Sci. 2008 Apr 1;6(2):247–259.

Table 1.

Conventional Way of Missing Data Classification: O=observed, X=missing.

Missing Data Pattern Wave 1 Wave 2 Wave 3
1 Completers O O O
2 Miss the last observation. O O X
3 Miss the last 2 observations. O X X
4 Intermittent missingness O X O