How can I compute the SE (standard error) of the concatenation of two samples?
Assume sample 1 has n observations,
sample 2 has m observations
The concatenation of sample 1 with sample 2 would have n+m observations.
If I know the mean of sample 1 = m1, and SE sample 1=se1,
the mean of sample 2 = m2, and SE sample 2=se2,
can I use n, m1, se1, m, m2, se2 to compute the SE?
Thank you,
John
John David Sorkin M.D., Ph.D.
Professor of Medicine
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology and Geriatric Medicine
Baltimore VA Medical Center
10 North Greene Street
GRECC (BT/18/GR)
Baltimore, MD 21201-1524
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