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SUMMARY OF FORMULAS FOR CHAPTER 3<br />

SUMMARY OF FORMULAS FOR CHAPTER 3 85<br />

Formula Number Name Formula<br />

3.2.1 Classical<br />

probability<br />

3.2.2 Relative<br />

frequency<br />

probability<br />

3.3.1–3.3.3 Properties of<br />

probability<br />

3.4.1 Multiplication<br />

rule<br />

P1E2 = m N<br />

P1E2 = m n<br />

P1E i 2 Ú 0<br />

P1E 1 2 + P(E 2 ) + Á + P(E n ) = 1<br />

P1E i + E j ) = P(E i ) + P(E j )<br />

P1A ¨ B2 = P1B2P1A ƒ B2 = P1A2P1B ƒ A2<br />

3.4.2 Conditional<br />

probability<br />

P1A ƒ B2 =<br />

P1A ¨ B2<br />

P1B2<br />

3.4.3 Addition rule<br />

3.4.4 Independent<br />

events<br />

3.4.5 Complementary<br />

events<br />

3.4.6 Marginal<br />

Probability<br />

Sensitivity of a<br />

screening test<br />

Specificity of a<br />

screening test<br />

P1A ´ B2 = P1A2 + P1B2 - P1A ¨ B2<br />

P1A ¨ B2 = P1A2P1B2<br />

P1A 2 = 1 - P1A2<br />

P1A i 2 = a P1A i ¨ B j 2<br />

P1T ƒ D2 =<br />

P1T ƒ D2 =<br />

a<br />

1a + c2<br />

d<br />

1b + d2<br />

3.5.1 Predictive value<br />

positive of a<br />

screening test<br />

3.5.2 Predictive value<br />

negative of a<br />

screening test<br />

P1D ƒ T2 =<br />

P1D ƒ T2 =<br />

P1T ƒ D2P1D2<br />

P1T ƒ D2P1D2 + P1T ƒ D2P1D2<br />

P1T ƒ D2P1D2<br />

P1T ƒ D2P1D2 + P1T ƒ D2P1D2<br />

Symbol Key<br />

• D disease<br />

• m the number of times an event E i occurs<br />

• n sample size or the total number of time a process occurs<br />

• N population size or the total number of mutually exclusive and<br />

equally likely events<br />

(Continued)

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