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. Author manuscript; available in PMC: 2014 Jun 12.
Published in final edited form as: Stat Methods Med Res. 2012 Dec 12;25(2):821–837. doi: 10.1177/0962280212469358

Table 2.

Results by various imputation methods for change of last visit.

Method Rank sum
difference (SE)
Ta p-value GTE
LOCF −202.6 (37.8) −5.4 8.32 e–8 0.127
Separate −111.5 (40.1) −2.8 5.71 e–3 0.070
MI −257.1 (42.9) −6.0 9.20 e–9 0.161

LOCF: last observation carried forward; MI: multiple imputation.