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st: Re: short time-series analysis

From   "George M Hoffman MD" <>
To   <>
Subject   st: Re: short time-series analysis
Date   Mon, 28 Mar 2005 09:26:35 -0600

each observation is a patient?
xtset i(patientid) t(month)
xtreg antibiotic group
adjust, by(group) se ci

then repeat the analysis if time<inttervention month, and for 
time>intervention month, to see if group differences developed after the 
George M Hoffman MD
Children's Hospital of Wisconsin
Associate Professor, Anesthesiology and Pediatrics
Medical College of Wisconsin
----- Original Message ----- 
From: "Thursky, Karin A" <>
To: <>
Sent: Monday, March 28, 2005 7:33 AM
Subject: st: short time-series analysis

I have a data on antibiotic usage per month (as grams) for 6 months before 
and 6 months after an intervention. The Cochrane group recommend repeated 
measures analysis, multiple t-tests and analysis of variance as accepted 
methodology for short time-series. (I assume that I have insuffucient data 
for an interrupted time series regression using ARIMA)
The data includes
- group (intervention/non-intervention)
- antibiotic in grams
- month
Can anyone suggest a stata methodology that is suitable for a short 
time-series analysis?

Karin Thursky
Infectious Diseases Physician
Royal Melbourne Hospital/Peter MacCallum Cancer Institute
0414 996649

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