ELIZA

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821596 occurrences (No.5 in the rank) during 5 years in the PubMed. [cache]

405) We conclude that the t-test is suitable for use when complete responses are present, although positively skewed data can result in the non-parametric test having higher power.

--- ABSTRACT ---

PMID:22179821 DOI:10.1177/0962280211432192

2015 Statistical methods in medical research

* The choice of test in phase II cancer trials assessing continuous tumour shrinkage when complete responses are expected.

- Traditionally, phase II cancer trials test a binary endpoint formed from a dichotomisation of the continuous change in tumour size. Directly testing the continuous endpoint provides considerable gains in power, although also results in several statistical issues. One such issue is when complete responses, i.e. complete tumour removal, are observed in multiple patients; this is a problem when normality is assumed. Using simulated data and a recently published phase II trial, we investigate how the choice of test affects the operating characteristics of the trial. We propose using parametric tests based on the censored normal distribution, comparing them to the t-test and Wilcoxon non-parametric test. The censored normal distribution fits the real dataset well, but simulations indicate its type-I error rate is inflated, and its power is only slightly higher than the t-test. The Wilcoxon test has deflated type I error. For two-arm designs, the differences are much smaller. We conclude that the t-test is suitable for use when complete responses are present, although positively skewed data can result in the non-parametric test having higher power.

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(2)34 in	(9)5 was	(16)3 it	(23)2 has
(3)24 null	(10)5 with	(17)3 these	(24)2 therapeutic
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--- WordNet output for use --- =>利用, 使う, 利用する, (体, 能力など)を働かす, 使用, 利用法 Overview of noun use The noun use has 7 senses (first 6 from tagged texts) 1. (90) use, usage, utilization, utilisation, employment, exercise -- (the act of using; "he warned against the use of narcotic drugs"; "skilled in the utilization of computers") 2. (18) function, purpose, role, use -- (what something is used for; "the function of an auger is to bore holes"; "ballet is beautiful but what use is it?") 3. (7) use -- (a particular service; "he put his knowledge to good use"; "patrons have their uses") 4. (1) consumption, economic consumption, usance, use, use of goods and services -- ((economics) the utilization of economic goods to satisfy needs or in manufacturing; "the consumption of energy has increased steadily") 5. (1) habit, use -- ((psychology) an automatic pattern of behavior in reaction to a specific situation; may be inherited or acquired through frequent repetition; "owls have nocturnal habits"; "she had a habit twirling the ends of her hair"; "long use had hardened him to it") 6. (1) manipulation, use -- (exerting shrewd or devious influence especially for one's own advantage; "his manipulation of his friends was scandalous") 7. use, enjoyment -- ((law) the exercise of the legal right to enjoy the benefits of owning property; "we were given the use of his boat") Overview of verb use The verb use has 6 senses (first 3 from tagged texts) 1. (603) use, utilize, utilise, apply, employ -- (put into service; make work or employ for a particular purpose or for its inherent or natural purpose; "use your head!"; "we only use Spanish at home"; "I can't use this tool"; "Apply a magnetic field here"; "This thinking was applied to many projects"; "How do you utilize this tool?"; "I apply this rule to get good results"; "use the plastic bags to store the food"; "He doesn't know how to use a computer") 2. (12) use, habituate -- (take or consume (regularly or habitually); "She uses drugs rarely") 3. (8) use, expend -- (use up, consume fully; "The legislature expended its time on school questions") 4. use -- (seek or achieve an end by using to one's advantage; "She uses her influential friends to get jobs"; "The president's wife used her good connections") 5. practice, apply, use -- (avail oneself to; "apply a principle"; "practice a religion"; "use care when going down the stairs"; "use your common sense"; "practice non-violent resistance") 6. use -- (habitually do something (use only in the past tense); "She used to call her mother every week but now she calls only occasionally"; "I used to get sick when I ate in that dining hall"; "They used to vacation in the Bahamas") --- WordNet end ---