S tatistik fo r M P H : 5 F ra d en 4 . u g es statistik u n d erv isn in g : F ...
S tatistik fo r M P H : 5 F ra d en 4 . u g es statistik u n d erv isn in g : F ...
S tatistik fo r M P H : 5 F ra d en 4 . u g es statistik u n d erv isn in g : F ...
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27If risks (“person-d<strong>en</strong>om<strong>in</strong>ators”) are used <strong>in</strong>stead of <strong>ra</strong>t<strong>es</strong>(“person-years-d<strong>en</strong>om<strong>in</strong>ators”):Ev<strong>en</strong>ts No-ev<strong>en</strong>ts TotalRisk factor + a c a + cRisk factor − b d b + dExactly the same calculations may be used:Replac<strong>in</strong>g y 1 by a + cand y 2 by b + dSee: Silva, p.329.28
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