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Applied Statistics Using SPSS, STATISTICA, MATLAB and R

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B.1 Discrete Distributions 437<br />

Probability function:<br />

n!<br />

n n<br />

m k<br />

n p p n K n<br />

k<br />

k P X n K X k nk<br />

p 1<br />

, , K,<br />

( 1,<br />

, ) ≡ ( 1 = 1,<br />

, = ) =<br />

1 K p<br />

1<br />

k<br />

n1!<br />

Kn<br />

k !<br />

k<br />

with ∑ =<br />

i=<br />

i p<br />

k<br />

1 ; ni ∈{0, 1, …, n},<br />

1<br />

∑ n =<br />

i= i n . B.10<br />

1<br />

Distribution function:<br />

M<br />

n,<br />

p1,<br />

K , pk<br />

( n<br />

Mean: µi = npi<br />

Variance: σi 2 = npiqi<br />

n1<br />

nk<br />

1,<br />

K, nk<br />

) = ∑ K∑<br />

mn,<br />

p1,<br />

K,<br />

pk<br />

i1<br />

= 0 ik<br />

= 0<br />

Properties:<br />

1. X ~ m n,<br />

p1,<br />

p2<br />

⇒ X ~ b n,<br />

p .<br />

1<br />

2. ρ ( X i , X j ) = −<br />

pi<br />

p j<br />

( 1−<br />

p )( 1−<br />

p<br />

.<br />

)<br />

n 1<br />

0 12345678910<br />

10<br />

i<br />

9<br />

8<br />

j<br />

7<br />

6<br />

k<br />

i i n<br />

( i1,<br />

K,<br />

ik<br />

) , ∑ n =<br />

= 1<br />

5<br />

4<br />

3<br />

2<br />

1<br />

0<br />

0.04<br />

0.02<br />

0<br />

0.1<br />

. B. 11<br />

m<br />

0.14<br />

Figure B.6. Multinomial probability function for the card-h<strong>and</strong> problem of<br />

Example B.6. The mode is m(0, 2, 8) = 0.1265.<br />

Example B. 6<br />

Q: Consider a h<strong>and</strong> of 10 cards drawn r<strong>and</strong>omly from a 52 cards deck. Compute<br />

the probability that the h<strong>and</strong> has at least one ace or two figures (king, dame or<br />

valet).<br />

0.12<br />

0.08<br />

0.06<br />

n 2

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