Здравствуйте! Пожалуйста, дайте подсказку по следующей задаче:
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Построить рандомизационный файл для условия:
3 группы лечения( а-б-с), 10 больниц, 200 пациентов, размер блока 12.
Колонки в файле – больница, последовательный рандомизационный номер, тип лечения.
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Из представленных условий понятно, что необходимо рассмотреть блоковую рандомизацию.
Я думаю, что нужно рассматривать каждый раз по 180 пациентов - 15 блоков, по 12 человек в каждом, вот таким образом:
aaaaabbbbbccccc
abcabcabcabcabc
... (всего получается 756756 способов).
Но каким именно образом построить рандомизационный файл, мне непонятно...
Спасибо.
 
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3 группы лечения
Mary#, 26.04.2015 17:06
PS2004R, 27.04.2015 10:23
(Mary# @ 27.04.2015 00:14)
Извиняюсь, рассматривать 192 пациента: 16 блоков по 12 пациентов, в каждом блоке группы лечения распределяются, например, так:aabbccaabbcc
abcabcabcabc
просто sample(c(rep("a", 4), rep("b", 4), rep("c", 4)))
CODE
> t(replicate(16, sample(c(rep("a", 4), rep("b", 4), rep("c", 4)))))
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12]
[1,] "c" "c" "a" "b" "b" "a" "a" "b" "b" "c" "a" "c"
[2,] "c" "b" "b" "b" "c" "a" "c" "a" "a" "a" "c" "b"
[3,] "c" "b" "b" "b" "a" "c" "b" "a" "c" "c" "a" "a"
[4,] "a" "a" "b" "c" "b" "a" "c" "c" "a" "b" "c" "b"
[5,] "b" "b" "c" "a" "c" "b" "c" "a" "a" "a" "b" "c"
[6,] "a" "b" "b" "a" "b" "c" "b" "c" "a" "c" "c" "a"
[7,] "b" "c" "c" "c" "a" "b" "c" "a" "a" "b" "b" "a"
[8,] "b" "c" "c" "a" "b" "c" "a" "a" "b" "b" "a" "c"
[9,] "b" "b" "b" "a" "a" "b" "c" "c" "c" "c" "a" "a"
[10,] "a" "b" "c" "c" "c" "a" "a" "c" "b" "a" "b" "b"
[11,] "c" "c" "c" "a" "b" "b" "b" "b" "a" "a" "a" "c"
[12,] "c" "c" "a" "b" "b" "a" "a" "c" "a" "b" "b" "c"
[13,] "a" "b" "c" "b" "b" "c" "c" "a" "a" "a" "c" "b"
[14,] "b" "b" "c" "a" "c" "a" "a" "c" "a" "c" "b" "b"
[15,] "a" "c" "b" "c" "b" "c" "b" "a" "b" "a" "c" "a"
[16,] "c" "b" "b" "a" "c" "c" "b" "c" "b" "a" "a" "a"
guest: great , 31.10.2018 17:58
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