Leej twg tsim cov kab sib npaug?

2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07

Vim tias, thaum John Tukey tau tsim lub thawv-thiab-whisker zaj dab neeg hauv 1977 los tso saib cov txiaj ntsig no, nws tau xaiv 1.5 × IQR raws li kab lus qhia rau cov neeg tawm. Qhov no tau ua haujlwm zoo, yog li peb tau txuas ntxiv siv tus nqi ntawd txij li thaum.

Leej twg tsim IQR?

Paul Velleman, tus kws txheeb cais ntawm Cornell University, yog tus tub ntxhais kawm ntawm John Tukey, uas tau tsim lub thawv ntawv thiab 1.5IQR Txoj Cai.

thawj qhov sib txawv yog dab tsi?

The IQR piav qhia qhov nruab nrab 50% ntawm qhov tseem ceeb thaum xaj los ntawm qis tshaj mus rau siab tshaj. Txhawm rau nrhiav qhov sib txawv ntawm qhov sib txawv (IQR), thawj zaug pom qhov nruab nrab (tus nqi nruab nrab) ntawm qis thiab sab saud ib nrab ntawm cov ntaub ntawv. Cov nqi no yog quartile 1 (Q1) thiab quartile 3 (Q3). IQR yog qhov txawv ntawm Q3 thiab Q1.

Vim li cas peb thiaj pom qhov sib txawv?

The IQR yog siv los ntsuas seb qhov sib kis cov ntaub ntawv cov ntsiab lus hauv ib txheej yog los ntawm qhov txhais tau li cas ntawm cov ntaub ntawv teeb. Qhov siab dua IQR, qhov ntau nthuav tawm cov ntsiab lus ntawm cov ntaub ntawv; Hauv qhov sib piv, qhov me me ntawm IQR, ntau cov ntaub ntawv cov ntsiab lus nyob ib ncig ntawm qhov nruab nrab.

Dab tsi yog qhov interquartile ntau yam tseem hu ua?

Hauv kev piav qhia txheeb cais, qhov sib txawv ntawm qhov sib txawv (IQR), tseem hu ua qhov nruab nrab, nruab nrab 50%, lossis H-spread , yog qhov ntsuas ntawm kev faib tawm, sib npaug. qhov sib txawv ntawm 75th thiab 25th feem pua, los yog nruab nrab ntawm sab sauv thiab qis quartiles, IQR=Q₃ −Q_{1. Hauv lwm lo lus, IQR yog thawj quartile …}