Cov txheej txheem:

Daim ntawv R qhia koj li cas?
Daim ntawv R qhia koj li cas?

Video: Daim ntawv R qhia koj li cas?

Video: Daim ntawv R qhia koj li cas?
Video: Daim ntawv tsis muaj koj npe - Ntxhoo chang || Nkauj tawm tshiab 2022 2024, Kaum ib hlis
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Tus qauv daim duab rau cov ntaub ntawv sib txawv, X-bar thiab R daim duab pab txiav txim seb tus txheej txheem puas ruaj khov thiab kwv yees tau. X-bar daim duab qhia tau hais tias qhov nruab nrab lossis qhov nruab nrab hloov pauv li cas thaum lub sijhawm thiab R daim duab qhia tau hais tias qhov ntau ntawm cov pab pawg neeg hloov pauv raws sijhawm. Nws kuj yog siv los saib xyuas cov teebmeem ntawm cov txheej txheem txhim kho theories.

Ib yam li ntawd, nws nug, R Bar txhais li cas?

sigmax kev yog Tus Txheej Txheem Sigma raws li Daim Ntawv Qhia Ntau Yam. d2 yog n. Nco tseg: Thaum tswj kev txwv rau X- Bar Daim ntawv qhia tau txhais raws li qhov tseem ceeb ruaj khov (xws li thaum cov ntaub ntawv keeb kwm siv los txheeb xyuas cov kev txwv), Qhov Nruab Nrab Range ( R - bar ) yuav tsum rov qab xam los ntawm cov kev txwv tswj ua ntej.

Kuj Paub, daim ntawv qhia txhais tau li cas? Cov txhais tau tias lub x-bar daim duab ntsuas lub hauv paus nyiam ntawm cov txheej txheem, whereas qhov ntau daim duab ntsuas qhov dispersion los yog variance ntawm tus txheej txheem. Vim tias ob qho kev hloov pauv tseem ceeb, nws ua rau kev nkag siab los saib xyuas cov txheej txheem siv ob qho tib si txhais tau tias thiab ntau yam kab kos.

Kuj kom paub yog, koj ua li cas nrhiav r ntawm daim ntawv tswj?

Cov kauj ruam hauv Kev Tsim Daim Ntawv X-R

  1. Sau cov ntaub ntawv. a. Xaiv qhov subgroup loj (n).
  2. Npaj cov ntaub ntawv. a.
  3. Xam cov txheej txheem tag nrho qhov nruab nrab thiab tswj kev txwv. a.
  4. Txhais ob kab kos rau kev tswj xyuas. a.
  5. Xam cov txheej txheem sib txawv, yog tias tsim nyog. a.

Yuav ua li cas koj pom qhov kev tswj hwm sab sauv hauv daim ntawv R?

xam lub X-bar Chart Upper Control Limit , los yog sab sauv txheej txheem ntuj txwv , los ntawm kev sib tw R -bar los ntawm qhov tsim nyog A2 yam (raws li subgroup loj) thiab ntxiv tus nqi rau qhov nruab nrab (X-bar-bar). UCL (X-bar) = X-bar-bar + (A2 x R -bar) Lub phiaj xwm tus Upper Control txwv ntawm X-bar daim duab . 9.

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