DATA BASICS By Farrokh Alemi, Ph.D.. How best to collect data? Statistics Is.

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Presentation transcript:

DATA BASICS By Farrokh Alemi, Ph.D.

How best to collect data? Statistics Is

How should it be analyzed? Statistics Is

What can we infer from the analysis? Statistics Is

Does Stent Reduce Risk of Stroke? Case Study

Is Stent Effective?

Summary Statistic Is Stent Effective?

Are differences large enough? Is Stent Effective?

StrokeNo EventTotal Stent No stent Total

Is Stent Effective? StrokeNo EventTotalRate Stent =45/224 No stent =28/227 Total

Is Stent Effective? StrokeNo EventTotalRate Stent % No stent % Total Summary Statistics

Is Stent Effective? StrokeNo EventTotalRate Stent % No stent % Total Is the 8% difference real?

Is Stent Effective? StrokeNo EventTotalRate Stent % No stent % Total Real difference or chance event ?

If cases and matched controls (or treatment and controls) have real differences Take Home Message