interaction(base)
interaction()所属R语言包：base
Compute Factor Interactions
计算因子的相互作用
译者：生物统计家园网 机器人LoveR
描述----------Description----------
interaction computes a factor which represents the interaction of the given factors. The result of interaction is always unordered.
interaction计算代表给定的因素相互作用的一个因素。的interaction结果总是无序。
用法----------Usage----------
interaction(..., drop = FALSE, sep = ".", lex.order = FALSE)
参数----------Arguments----------
参数：...
the factors for which interaction is to be computed, or a single list giving those factors.
计算，或一个单一的名单，让这些因素相互作用的因素。
参数：drop
if drop is TRUE, unused factor levels are dropped from the result. The default is to retain all factor levels.
drop如果是TRUE，未使用的因子水平下降的结果。默认是保留所有因子水平。
参数：sep
string to construct the new level labels by joining the constituent ones.
加入组成的字符串构造新的水平标签。
参数：lex.order
logical indicating if the order of factor concatenation should be lexically ordered.
逻辑表明，如果要素串联的顺序应词法下令。
值----------Value----------
A factor which represents the interaction of the given factors. The levels are labelled as the levels of the individual factors joined by sep which is . by default.
一个因素代表给定的因素的相互作用。被标记为sep是.默认情况下，加入个人因素水平水平。
By default, when lex.order = FALSE, the levels are ordered so the level of the first factor varies fastest, then the second and so on. This is the reverse of lexicographic ordering (which you can get by lex.order = TRUE), and differs from :. (It is done this way for compatibility with S.)
默认情况下，当lex.order = FALSE，水平排列的，所以第一个因素的水平变化最快的，那么第二等。这是字典排序的反向（你可以通过lex.order = TRUE），并从:不同。 （这是做了这样的相容性与S）
参考文献----------References----------
Statistical Models in S. Wadsworth & Brooks/Cole.
参见----------See Also----------
factor; : where f:g is similar to interaction(f, g, sep=":") when f and g are factors.
factor;:其中f:g类似interaction(f, g, sep=":")当f和g的因素。
举例----------Examples----------
a <- gl(2, 4, 8)
b <- gl(2, 2, 8, labels = c("ctrl", "treat"))
s <- gl(2, 1, 8, labels = c("M", "F"))
interaction(a, b)
interaction(a, b, s, sep = ":")
stopifnot(identical(a:s,
interaction(a, s, sep = ":", lex.order = TRUE)),
identical(a:s:b,
interaction(a, s, b, sep = ":", lex.order = TRUE)))
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注：
注1：为了方便大家学习，本文档为生物统计家园网机器人LoveR翻译而成，仅供个人R语言学习参考使用，生物统计家园保留版权。
注2：由于是机器人自动翻译，难免有不准确之处，使用时仔细对照中、英文内容进行反复理解，可以帮助R语言的学习。
注3：如遇到不准确之处，请在本贴的后面进行回帖，我们会逐渐进行修订。
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发表于 2012-2-16 19:40:27
