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.
Yours sincerely Ping Zhang
March 7, 2010
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