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Slika - Shrani.si

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A. Juriˇ<strong>si</strong>ć in V. Batagelj: Verjetnostni račun in statistika 669<br />

✬<br />

V primeru linearnega trenda<br />

✫<br />

XT = a + bT,<br />

n<br />

(Xi − a − bTi) 2 = min .<br />

i=1<br />

dobimo naslednjo oceno trenda<br />

n i=1<br />

XT = X +<br />

(Xi − X)(Ti − T )<br />

n i=1 (Ti − T ) 2<br />

(T − T ).<br />

Ponavadi je čas T transformiran tako, da je t = 0. Tedaj je ocena trenda<br />

n i=1<br />

XT = X +<br />

(Xi − X) · ti<br />

n i=1 t2 t.<br />

i<br />

Univerza v Ljubljani ▲<br />

❙ ▲<br />

▲<br />

● ❙ ▲<br />

▲<br />

☛ ✖<br />

▲<br />

✩<br />

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