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PROGRAMM ZUR RISIKO-KALKULATION in einer 4-Felder-Tafel mit ChiQuadrat-Test
und Berechnung der Konfidenz-Intervalle
These calculators are for educational use. They are believed accurate but no responsibility for accuracy of the results is accepted by the author.
Die einzelnen Datenfelder der 4-Felder-Tafel definieren sich mathematisch wie folgt:
|
KRANK (+) |
GESUND (-) |
QuerSumme |
Risiko (Rate) |
Relative Risiken |
mit Therapie |
mk = SS1/(1+[1/O1]) |
mg = SS2/(1+[1/O2]) |
QS1 = mk+mg |
R1 = mk/QS1 |
RRR = ARR/R2 |
ohne Therap |
ok = mk/O1 |
og = mg/O2 |
QS2 = ok+og |
R2 = ok/QS2 |
ARR = R2-R1 |
SenkrSumme |
SS1 = mk+ok |
SS2 = mg+og |
TOT = SS1+SS2 |
PV = SS1/TOT |
NNT = 1/ARR |
RiskRelations |
O1 = mk/ok |
O2 = mg/og |
OR=O1/O2 |
RR=R1/R2 |
RR+RRR = 1 |
Fischer's exact, der alpha-Fehler binomial formuliert:
α = p =s=0Σs=mk (SS1s) * (SS2QS1-s) / (TOTQS1)
Die Summationsformel der hypergeometrischen Verteilung
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