Dab tsi yog qhov kev sim tshuaj sib xyaw ua ke?

2024 Tus sau: Stanley Ellington | [email protected]. Kawg hloov kho: 2023-12-16 00:17

A kev kawm sib npaug yog ib hom kev kawm kho mob qhov twg ob pab kho mob, A thiab B, yog li ntawd ib pab tau txais tsuas yog A thaum lwm pab pawg tau txais B. Lwm cov npe rau hom no. kawm suav nrog "nruab nrab ntawm tus neeg mob" thiab "tsis yog-crossover".

Tom qab ntawd, txoj kev kawm sib luag thiab kev sib tw yog dab tsi?

A kev kawm sib npaug kuj tseem hu ua "nruab nrab tus neeg mob" lossis "tsis yog- crossover ” kawm . Nws txhais tau tias yog ib hom kev kho mob kawm , nyob rau hauv uas ob sab caj npab kho mob, A thiab B, yog muab kom ib pab neeg tau txais kev kho mob caj npab A nkaus xwb thaum lwm pab pawg tau txais kev kho caj npab B xwb.

Ib yam li ntawd, kev kawm crossover txhais li cas? Hauv tshuaj, a kev kawm crossover los yog crossover sim yog ib longitudinal kawm nyob rau hauv uas cov kev kawm tau txais ib theem ntawm kev kho mob sib txawv (los yog raug). Thaum kev tshawb fawb crossover tuaj yeem soj ntsuam kev kawm , ntau yam tseem ceeb kev tshawb fawb crossover yog cov kev sim tswj, uas tau tham hauv kab lus no.

Ib yam li ntawd, txoj hauj lwm sib luag yog dab tsi?

Parallel txoj haujlwm yog ntawm nws qhov yooj yim tshaj plaws thaum muaj tib tus lej ntawm lvalues thiab rvalues: x, y, z = 1, 2, 3 # x = 1; y = 2; z = 3. Hauv qhov no, thawj rvalue yog muab mus rau thawj tus nqi; qhov thib ob rvalue yog muab mus rau lub thib ob lvalue; thiab lwm yam.

Puas yog txoj kev kawm crossover yog RCT?

Common kawm designs Parallel thiab crossover designs yog ob tus qauv tsim rau RCTs . Dhau li ntawm randomization ntawm cov kev kho mob sib lawv liag, ntxuav-hauv thiab ntxuav tawm lub sij hawm ntawm qhov tsim nyog ntev yog feem ntau siv nyob rau hauv kev tshawb fawb crossover kom tsis txhob muaj kev cuam tshuam nqa.