[R] questions about "Cusum"

[Christopher W. Ryan]

I've found the "surveillance" package useful for monitoring walk-in 
clinic visits in our county as the influenza pandemic evolved. It might 
serve your needs for monitoring IFI (invasive fungal infections?) in 
your hospital.

--Chris
Christopher W. Ryan, MD
SUNY Upstate Medical University Clinical Campus at Binghamton
425 Robinson Street, Binghamton, NY  13904
cryanatbinghamtondotedu

"If you want to build a ship, don't drum up the men to gather wood, 
divide the work and give orders. Instead, teach them to yearn for the 
vast and endless sea."  [Antoine de St. Exupery]

Achim Zeileis wrote:
> 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
>>     [[alternative HTML version deleted]]
>>
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> 
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>