⇤ ← Revision 1 as of 2007-04-23 14:52:05
495
Comment:
|
663
|
Deletions are marked like this. | Additions are marked like this. |
Line 1: | Line 1: |
Line 5: | Line 4: |
|||| Sober Drunk Complied 106 9 Refused 59 56 |
||||||||<style="TEXT-ALIGN: center"> '''Group''' || '''Sober''' || '''Drunk''' || || || ||||||||<style="TEXT-ALIGN: center"> Complied || 106 || 9 || || || ||||||||<style="TEXT-ALIGN: center"> Refused || 59 || 56 || || || |
Line 15: | Line 12: |
You can obtain a confidence interval for thso dds ratio [FAQ:oddsr:using some simple calculations] or by clicking on risk under statistics in the crosstabs procedure in SPSS. | You can obtain a confidence interval for thso dds ratio [FAQ/oddsr:using some simple calculations] or by clicking on risk under statistics in the crosstabs procedure in SPSS. |
Odds Ratios are useful in summarising the effect size or magnitude of a difference in a 2x 2 table.
For example
Group |
Sober |
Drunk |
|
|
||||||||<style="TEXT-ALIGN: center"> Complied || 106 || 9 || || || ||||||||<style="TEXT-ALIGN: center"> Refused || 59 || 56 || || ||
Odds Ratio = (106/9) / (59/56) = (106x56) / (9x59) = 11.18
The compliers were 11 times more likely to be sober than the refusers.
You can obtain a confidence interval for thso dds ratio [FAQ/oddsr:using some simple calculations] or by clicking on risk under statistics in the crosstabs procedure in SPSS.