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Pedro Ronalt Vieira - DPI - Inpe

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31<br />

3) Vari^ancia (Frery, 1993; Yanasse et al., 1993, 1995):<br />

Var(X) = ®+n+1<br />

¯<br />

®n<br />

2<br />

4) Estimadorespelo Metodo dos Momentos(Frery, 1993; Yanasse et al., 1993,<br />

1995):<br />

onde:<br />

b®m =<br />

b¯m = cm1<br />

cm 2 1 (bnm +1)<br />

bn m(cm 2 ¡ cm 2 1 ) ¡ cm2 1<br />

bn m = ¡b § p c<br />

2a<br />

a= 2cm 2 2 ¡ cm 2 1 cm2 ¡ cm1 cm3<br />

b =4cm 2 2 ¡3cm2 1 cm2 ¡ cm1cm3<br />

c = cm 4 1 cm2 2 ¡8cm2 1 cm3 2 ¡2cm3 1 cm2cm3 +16cm 4 2 ¡8cm1cm 2 2 cm3 + cm 2 1 cm2 3<br />

5) Se o numero equivalente de visadasn e conhecido, os par^ametros® e¯<br />

s~ao estimados por:<br />

cm<br />

b®m =<br />

2 1 (n+1)<br />

n(cm2 ¡ cm 2 1) ¡ cm 2 1<br />

b¯ m = cm 1

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