https://communities.sas.com/t5/Statistical-Procedures/Difference-in-difference-method/m-p/265350#M13981 <P>Backgound</P><P>My research is on the quantum of repetitions of investigations in a tertiary care hospital setting. I have calculated the no of repetitions month wise for an entire year in two departments. I have carried out an intervention (educational lectures) in one department in an attempt to reduce the repetition. Now I want to analyse whether the intervention has had any impact on the repetitions. We presume that there is a decrease in repetition owing to the increase in knowledge with time. How do Ievaluate the same using SAS. Kindly help.</P><P>&nbsp;</P><P>Regards and thanks.</P><P>&nbsp;</P> Thu, 21 Apr 2016 08:24:38 GMT pailokesh 2016-04-21T08:24:38Z https://communities.sas.com/t5/Statistical-Procedures/Difference-in-difference-method/m-p/265350#M13981 <P>Backgound</P><P>My research is on the quantum of repetitions of investigations in a tertiary care hospital setting. I have calculated the no of repetitions month wise for an entire year in two departments. I have carried out an intervention (educational lectures) in one department in an attempt to reduce the repetition. Now I want to analyse whether the intervention has had any impact on the repetitions. We presume that there is a decrease in repetition owing to the increase in knowledge with time. How do Ievaluate the same using SAS. Kindly help.</P><P>&nbsp;</P><P>Regards and thanks.</P><P>&nbsp;</P> Thu, 21 Apr 2016 08:24:38 GMT https://communities.sas.com/t5/Statistical-Procedures/Difference-in-difference-method/m-p/265350#M13981 pailokesh 2016-04-21T08:24:38Z https://communities.sas.com/t5/Statistical-Procedures/Difference-in-difference-method/m-p/265450#M13982 <P>Do I understand you to say that you collected data without an analysis plan?</P> Thu, 21 Apr 2016 15:28:42 GMT https://communities.sas.com/t5/Statistical-Procedures/Difference-in-difference-method/m-p/265450#M13982 ballardw 2016-04-21T15:28:42Z https://communities.sas.com/t5/Statistical-Procedures/Difference-in-difference-method/m-p/265492#M13985 <P>Can you rephrase your question in plain language, please? Expressions such as "difference in difference" and "quantum of repetitions of investigations" and "impact on the repetitions" are very fuzzy to me.&nbsp;</P> Thu, 21 Apr 2016 18:56:10 GMT https://communities.sas.com/t5/Statistical-Procedures/Difference-in-difference-method/m-p/265492#M13985 PGStats 2016-04-21T18:56:10Z