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Slika - Shrani.si

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A. Juriˇ<strong>si</strong>ć in V. Batagelj: Verjetnostni račun in statistika 173<br />

✬<br />

Phi (x)<br />

−0.4 −0.2 0.0 0.2 0.4<br />

✫<br />

−6 −4 −2 0 2 4 6<br />

> Phi curve(Phi,-6.6)<br />

x<br />

Funkcija napake Φ(x)<br />

Funkcija napake imenujemo funkcijo<br />

Φ(x) = 1<br />

√ 2π<br />

x<br />

0<br />

1 −<br />

e 2 t2<br />

dt.<br />

Funkcija napake je liha, zvezno odvedljiva,<br />

strogo naraˇsčajoča funkcija.<br />

Φ(−∞) = − 1<br />

1<br />

2 , Φ(0) = 0, Φ(∞) = 2<br />

in Pn(k1, k2) ≈ Φ(xk2 ) − Φ(xk1 ).<br />

Vrednosti funkcije napake najdemo v<br />

tabelah ali pa je vgrajena v statističnih<br />

programih.<br />

> x2 x1 pnorm(x2)-pnorm(x1)<br />

[1] 0.5<br />

Univerza v Ljubljani ▲<br />

❙ ▲<br />

▲<br />

● ❙ ▲<br />

▲<br />

☛ ✖<br />

▲<br />

✩<br />

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