On Jun 14, 2010, at 10:42 AM, SHANE MILLER, BLOOMBERG/ 731 LEXIN wrote:
Hi,
Suppose I analyze a log to create a histogram:
event E1 occurred N1 times
event E2 occurred N2 times
...
... for m total events
...
event Em occurred Nm times
The total number of occurrences is: T = Sum Nj
j=1..m
I want to give this histogram to R and ask it to produce T random
events such that approximately N1 instances of E1 are drawn, N2
instances of E2 drawn, and so forth.
?table # or perhaps use the fact that hist() will return a table of a
particular type.
?sample # from the events with prob = frequencies/T
(If you insist on constraining the total count to be the observed sum
it will no longer be random with m degrees of freedom. And there are
many postings on how to do this in the archives.)
--
David Winsemius, MD
West Hartford, CT
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