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A. Juriˇsić in V. Batagelj: Verjetnostni račun in statistika 281 ✬ ✫ Frekvenčna porazdelitev ˇStevilo vseh moˇznih vrednosti proučevane spremenljivke je lahko preveliko za pregledno prikazovanje podatkov. Zato sorodne vrednosti razvrstimo v skupine. Posamezni skupini priredimo ustrezno reprezentativno vrednost, ki je nova vrednost spremenljivke. Skupine vrednosti morajo biti določene enolično: vsaka enota s svojo vrednostjo je lahko uvrˇsčena v natanko eno skupino vrednosti. Frekvenčna porazdelitev spremenljivke je tabela, ki jo določajo vrednosti ali skupine vrednosti in njihove frekvence. Če je spremenljivka vsaj urejenostna, vrednosti (ali skupine vrednosti) uredimo od najmanjˇse do največje. Skupine vrednosti ˇstevilskih spremenljivk imenujemo razredi. Univerza v Ljubljani ▲ ❙ ▲ ▲ ● ❙ ▲ ▲ ☛ ✖ ▲ ✩ ✪
A. Juriˇsić in V. Batagelj: Verjetnostni račun in statistika 282 ✬ ✫ . . . Frekvenčna porazdelitev xmin in xmax – najmanjˇsa in največja vrednost spremenljivke X. xi,min in xi,max – spodnja in zgornja meja i-tega razreda. Meje razredov so določene tako, da velja xi,max = xi+1,min. ˇSirina i-tega razreda je di = xi,max − xi,min. Če je le mogoče, vrednosti razvrstimo v razrede enake ˇsirine. Sredina i-tega razreda je xi = xi,min+xi,max 2 predstavnik tega razreda. in je značilna vrednost – Kumulativa (ali nakopičena frekvenca) je frekvenca do spodnje meje določenega razreda. Velja Fi+1 = Fi + fi, kjer je Fi kumulativa in fi frekvenca v i-tem razredu. Univerza v Ljubljani ▲ ❙ ▲ ▲ ▲ ● ❙ ▲ ▲ ☛ ✖ ✩ ✪
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✬ ✫ Ljubljana, 6. oktober 2008
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