# The correct statistical measures to reflect differences

*From*: "ela" <ela@xxxxxxxxxx>*Date*: Mon, 9 Aug 2010 09:39:28 +0800

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Scenario A:

treatment num percent

drug 75 54%

placebo 300 12%

as S.D. is not known for both groups, C.I. cannot be applied. what else

statistics can be used to reflect the difference?

Scenario B:

Site IDs accident number

1 1

2 0

3 2

4 3

5 0

.....

1995 0

1996 2

1997 1

1998 0

1999 3

2000 0

The accident event is rare but we want to know whether it occurs more than

purely by chance. What statistical measure can we use for reference?

.

**Follow-Ups**:**Re: The correct statistical measures to reflect differences***From:*Rich Ulrich

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