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- Medical English LInking keywords finder for the PubMed Zipped Archive (ELIZA) -

return kwic search for under out of >500 occurrences
321496 occurrences (No.66 in the rank) during 5 years in the PubMed. [no cache] 500 found
17) As the non-inferiority margin odds ratio decreases from 0.5, the score test closed form formula increasingly overestimates the sample size irrespective of the magnitude of the odds ratio under the alternative hypothesis.
--- ABSTRACT ---
PMID:24492793 DOI:10.1177/0962280214520729
2015 Statistical methods in medical research
* Sample size considerations in active-control non-inferiority trials with binary data based on the odds ratio.
- This paper presents an approximate closed form sample size formula for determining non-inferiority in active-control trials with binary data. We use the odds-ratio as the measure of the relative treatment effect, derive the sample size formula based on the score test and compare it with a second, well-known formula based on the Wald test. Both closed form formulae are compared with simulations based on the likelihood ratio test. Within the range of parameter values investigated, the score test closed form formula is reasonably accurate when non-inferiority margins are based on odds-ratios of about 0.5 or above and when the magnitude of the odds ratio under the alternative hypothesis lies between about 1 and 2.5. The accuracy generally decreases as the odds ratio under the alternative hypothesis moves upwards from 1. As the non-inferiority margin odds ratio decreases from 0.5, the score test closed form formula increasingly overestimates the sample size irrespective of the magnitude of the odds ratio under the alternative hypothesis. The Wald test closed form formula is also reasonably accurate in the cases where the score test closed form formula works well. Outside these scenarios, the Wald test closed form formula can either underestimate or overestimate the sample size, depending on the magnitude of the non-inferiority margin odds ratio and the odds ratio under the alternative hypothesis. Although neither approximation is accurate for all cases, both approaches lead to satisfactory sample size calculation for non-inferiority trials with binary data where the odds ratio is the parameter of interest.
--- ABSTRACT END ---
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(1)95 the (18)4 these (35)2 axial (52)2 of
(2)13 different (19)3 high (36)2 censoring (53)2 optimal
(3)12 a (20)3 investigation (37)2 clinical (54)2 physiological
(4)9 general (21)3 light (38)2 consideration (55)2 pulsatile
(5)8 both (22)3 local (39)2 controlled (56)2 scanning
(6)8 which (23)3 mechanical (40)2 current (57)2 serum-free
(7)7 various (24)2 *null* (41)2 evaluation (58)2 several
(8)6 conditions (25)2 12 (42)2 ex (59)2 simulated
(9)6 curve (26)2 15 (43)2 extreme (60)2 specific
(10)6 static (27)2 2 (44)2 four (61)2 steady-state
(11)5 and (28)2 CA (45)2 hypertensive (62)2 therapy
(12)4 5 (29)2 CT (46)2 hypoxia (63)2 this
(13)4 certain (30)2 H2O2-induced (47)2 hypoxic (64)2 time
(14)4 control (31)2 UV (48)2 inflammatory (65)2 treatment
(15)4 either (32)2 acute (49)2 laser (66)2 ultrasound
(16)4 in (33)2 additive (50)2 lateral (67)2 vertical
(17)4 normal (34)2 adverse (51)2 mortality (68)2 water

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--- WordNet output for under --- =>以下の, (治療, 試練, 刑罰)を受けて, 下部の, の下に, ・・の下に Overview of adj under The adj under has 2 senses (first 2 from tagged texts) 1. (2) nether, under -- (located below or beneath something else; "nether garments"; "the under parts of a machine") 2. (1) under -- (lower in rank, power, or authority; "an under secretary") Overview of adv under The adv under has 8 senses (first 1 from tagged texts) 1. (2) under -- (down to defeat, death, or ruin; "their competitors went under") 2. under -- (through a range downward; "children six and under will be admitted free") 3. under -- (into unconsciousness; "this will put the patient under") 4. under -- (in or into a state of subordination or subjugation; "we must keep our disappointment under") 5. under -- (below some quantity or limit; "fifty dollars or under") 6. under -- (below the horizon; "the sun went under") 7. under -- (down below; "get under quickly!") 8. under, below -- (further down; "see under for further discussion") --- WordNet end ---