On Sun, 7 Mar 2010, sdzhangping wrote:
Dear friends:
I have just read an article entitled " Monitoring of nosocomial invasive aspergillosis and early
evidence of an outbreak using cumulative sum tests (CUSUM)", which is published in "Clinical
Microbiology and Infection". We have great need to estimate the fluctuation of incidence of IFI in our
hospital. But I don't know the details of the stastical method and don't know where can I get a
"Cusum" package. Can you give me some materials about Cusum test? An example is more appreciated.
There are many techniques with the label CUSUM and I didn't look up what
the specific meaning is in the article you cite. There are tests based on
(mostly linear) regression models with that label, many (but not all
conceivable) of these are implemented in the "strucchange" package. See
vignette("strucchange-intro", package = "strucchange")
as well as
citation("strucchange")
for pointers to papers explaining the ideas behind it. But beyond that
there are also other techniques, in particular from statistical process
control. See the "spc", "qcc", "IQCC" packages among others.
hth,
Z
Yours sincerely Ping Zhang
March 7, 2010
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