Eri*_*een 6 r cluster-analysis text-mining unsupervised-learning
我有大约一千个潜在的调查项目作为字符串向量,我想减少到几百.通常,当我们谈论数据减少时,我们有实际数据.我将项目管理给参与者并使用因子分析,PCA或其他一些降维方法.
就我而言,我没有任何数据.只是项目(即文本字符串).我想通过消除具有相似含义的项目来减少集合.据推测,如果实际给予参与者,他们将是高度相关的.
我一直在阅读有关文本分析的聚类方法.这个SO问题展示了我在不同的例子中看到过的方法.OP指出,群集解决方案并不能完全回答他/她的问题.以下是在我的案例中如何应用(令人不满意):
# get data (2 columns, 152 rows)
使用样本项的dput()链接到text.R文件
# clustering
library(tm)
library(Matrix)
x <- TermDocumentMatrix( Corpus( VectorSource(text$item) ) )
y <- sparseMatrix( i=x$i, j=x$j, x=x$v, dimnames = dimnames(x) )
plot( hclust(dist(t(y))) )
该图显示项目145和149是聚类的:
145"让你知道你不被通缉"
149"让你知道他爱你"
这些项目共享相同的词干,"让你知道",这可能是聚类的原因.从语义上讲,它们是对立的.
OP与他/她的例子有类似的挑战.一位意见提供者指出wordnet包装是一种可能的解决方案.
问题(根据反馈编辑)
我怎样才能阻止像145和149这样的项目进行聚类,因为它们共享干？
问题重点较少的次要问题:有人在这里看到更好的解决方案吗？我遇到的许多方法都涉及监督学习,测试/训练数据集和分类.我相信我正在寻找的是更多的语义相似性/聚类(例如,FAC pdf).
+1 @TylerRinker 的建议
您应该尝试的另一个选择是从二元组而不是一元组创建术语文档矩阵。如果您对短语感兴趣，二元组是一个很好的开始。我这里有一个有效的例子。
这是一个将停用词删除与二元组相结合的有效示例。通过此示例，您可以使用不同的参数值进行迭代，以获得对您来说最合理的聚类。
获取数据...
dat <- text <- structure(list(id = c("GHQ1", "GHQ2", "GHQ3", "GHQ4", "GHQ5",
"GHQ6", "GHQ7", "GHQ8", "GHQ9", "GHQ10", "GHQ11", "GHQ12", "GHQ13",
"GHQ14", "GHQ15", "GHQ16", "GHQ17", "GHQ18", "GHQ19", "GHQ20",
"GHQ21", "GHQ22", "GHQ23", "GHQ24", "CGMH9", "GHQ25", "GHQ26",
"GHQ27", "GHQ28", "GHQ29", "GHQ30", "GHQ31", "PARQ01A-P", "PARQ02A-P",
"PARQ03A-P", "PARQ04A-P", "PARQ05A-P", "PARQ06A-P", "PARQ07A-P",
"PARQ08A-P", "PARQ09A-P", "PARQ10A-P", "PARQ11A-P", "PARQ12A-P",
"PARQ13A-P", "PARQ14A-P", "PARQ15A-P", "PARQ16A-P", "PARQ17A-P",
"PARQ18A-P", "PARQ19A-P", "PARQ20A-P", "PARQ21A-P", "PARQ22A-P",
"PARQ23A-P", "PARQ24A-P", "PARQ25A-P", "PARQ26A-P", "PARQ27A-P",
"PARQ28A-P", "PARQ29A-P", "PARQ30A-P", "PARQ31A-P", "PARQ32A-P",
"PARQ33A-P", "PARQ34A-P", "PARQ35A-P", "PARQ36A-P", "PARQ37A-P",
"PARQ38A-P", "PARQ39A-P", "PARQ40A-P", "PARQ41A-P", "PARQ42A-P",
"PARQ43A-P", "PARQ44A-P", "PARQ45A-P", "PARQ46A-P", "PARQ47A-P",
"PARQ48A-P", "PARQ49A-P", "PARQ50A-P", "PARQ51A-P", "PARQ52A-P",
"PARQ53A-P", "PARQ54A-P", "PARQ55A-P", "PARQ56A-P", "PARQ57A-P",
"PARQ58A-P", "PARQ59A-P", "PARQ60A-P", "PARQ01A-C", "PARQ02A-C",
"PARQ03A-C", "PARQ04A-C", "PARQ05A-C", "PARQ06A-C", "PARQ07A-C",
"PARQ08A-C", "PARQ09A-C", "PARQ10A-C", "PARQ11A-C", "PARQ12A-C",
"PARQ13A-C", "PARQ14A-C", "PARQ15A-C", "PARQ16A-C", "PARQ17A-C",
"PARQ18A-C", "PARQ19A-C", "PARQ20A-C", "PARQ21A-C", "PARQ22A-C",
"PARQ23A-C", "PARQ24A-C", "PARQ25A-C", "PARQ26A-C", "PARQ27A-C",
"PARQ28A-C", "PARQ29A-C", "PARQ30A-C", "PARQ31A-C", "PARQ32A-C",
"PARQ33A-C", "PARQ34A-C", "PARQ35A-C", "PARQ36A-C", "PARQ37A-C",
"PARQ38A-C", "PARQ39A-C", "PARQ40A-C", "PARQ41A-C", "PARQ42A-C",
"PARQ43A-C", "PARQ44A-C", "PARQ45A-C", "PARQ46A-C", "PARQ47A-C",
"PARQ48A-C", "PARQ49A-C", "PARQ50A-C", "PARQ51A-C", "PARQ52A-C",
"PARQ53A-C", "PARQ54A-C", "PARQ55A-C", "PARQ56A-C", "PARQ57A-C",
"PARQ58A-C", "PARQ59A-C", "PARQ60A-C"), item = c("Been feeling unhappy or depressed",
"Been feeling reasonably happy, all things considered", "Feeling edgy and bad-tempered",
"Feel constantly under strain", "Found everything getting on top of you",
"Been feeling nervous and strung-up all the time", "found at times you couldn't do anything because your nerves were too bad",
"found everything getting on top of you", "thought of the possibility that you might make away with yourself",
"found that the idea of taking your own life kept coming into your mind?",
"found yourself withing you were dead and away from it all?",
"felt that life isn't worth living", "felt that life was entirely hopeless?",
"been able to enjoy your normal day-to-day activities", "been satisfied with the way you've carried out your task",
"felt that you are playing a useful part in things", "felt on the whole you were doing things well?",
"been feeling perfectly well and in good health", "been feeling in need of a good tonic",
"been feeling run down and out of sorts?", "felt that you are ill",
"been getting any pains in your head", "been getting a feeling of tightness or pressure in your head",
"been having hot or cold spells", "Do you feel you have physical problems because of stress?",
"Lost sleep over worry", "Had difficulty in staying asleep once you are off",
"felt capable of making decisions about things", "been taking longer over the things that you do",
"been managing to keep yourself busy and occupied", "been thinking of yourself as a worthless person",
"been getting scared or panicky for no good reason ", "You say nice things about your child",
"You nag or scold your child when (s)he is bad", "You ignore your child",
"You wonder if you really love your child", "You talk to your child about daily routines and plans, and listen to what (s)he has to say",
"You complain about your child to others when (s)he does not listen to you",
"You take an interest in your child", "You want your child to bring friends home, and you try to make things pleasant for them",
"You call your child names and make fun of him/her", "You ignore your child as long as (s)he does nothing to bother you",
"You yell at your child when you are angry", "You sit close with your child so that (s)he feels free to talk about important things",
"You are harsh with your child", "You enjoy having your child around you",
"You make your child feel proud when (s)he does well", "Your hit your child even when (s)he may not deserve it, like for small mistakes",
"You forget things you are supposed to do for your child", "You see your child as an annoyance",
"You praise your child to others", "You punish your child when you are angry",
"You make sure your child has the right kind of food to eat",
"You talk to your child in a warm and loving way", "You get angry easily at your child",
"You are too busy to answer your child's questions", "You hate/despise your child",
"You say nice things to your child when (s)he deserves it, such as when (s)he does well in school",
"You are irritable with your child", "You care about who your child's friends are",
"You are really interested in what your child does", "You say many unkind things to your child",
"You pay no attention to your child when (s)he asks for help",
"You think it is your child's own fault when (s)he is having trouble",
"You make your child feel wanted and needed", "You tell your child (s)he annoys you",
"You pay a lot of attention to your child", "You tell your child how proud you are of him/her when (s)he is good",
"You hurt your child's feelings", "You forget important things your child thinks you should remember",
"When your child misbehaves, you make him/her feel unloved",
"You make your child feel what (s)he does is important", "When your child does something wrong, you frighten or threaten him/her",
"You like to spend time with your child, for example you sit and laugh together",
"You try to help your child when (s)he is scared or upset", "When your child misbehaves, you shame him/her in front of his/her friends",
"You avoid your child's company", "You complain about your child",
"You care about what your child thinks, and encourage him/her to talk about it",
"You feel other children are better than your own child", "When you make plans, you take your child's thoughts into consideration",
"You let your child do things (s)he thinks are important, even if it is hard for you",
"When your child misbehaves, you compare him/her unfavorably with other children",
"You want to leave your child in someone else's care (for example, a neighbor or relative)",
"You let your child know (s)he is not wanted", "You are interested in the things your child does",
"You try to make your child feel better when (s)he is hurt or sick",
"You tell your child you are ashamed of him/her when (s)he misbehaves",
"You let your child know you love him/her", "You treat your child gently and with kindness",
"When your child misbehaves, you make him/her feel ashamed or guilty",
"You try to make your child happy", "Says nice things about you",
"Nags or scolds you when you are bad", "Ignores you", "Does not really love you",
"Talks to you about your plans and listens to what you have to say",
"Complains about you to others when you do not listen to him",
"Takes an interest in you", "Wants you to bring your friends home, and tries to make things pleasant for them",
"Calls you names, ridicules you, and makes fun of you", "Ignores you as long as you do nothing to bother him",
"Yells at you when he is angry", "Sits close with you so that you feel free to talk about important things",
"Treats you harshly", "Enjoys having you around him", "Make you feel proud when you do well",
"Hits you even when you do not deserve it, like for small mistakes",
"Forgets things he is supposed to do for you", "Sees you as an annoyance",
"Praises you to others", "Punishes you severely when he is angry",
"Makes sure you have the right kind of food to eat", "Talks to you in a warm and loving way",
"Gets angry at you easily", "Is too busy to answer your questions",
"Seems to hate / despise you", "Says nice things to you when you deserve them, such as when you do well in school",
"Gets mad quickly and picks on you", "Wants to know who your friends are",
"Is really interested in what you do", "Says many unkind things to you",
"Pays no attention when you ask for help", "Thinks it is your own fault when you are having trouble",
"Makes you feel wanted and needed", "Tells you that you annoy him",
"Pays a lot of attention to you", "Tells you how proud he is of you when you are good",
"Goes out of his way to hurt your feelings", "Forgets important things you think he should remember",
"Makes you feel unloved if you misbehave", "Makes you feel what you do is important",
"Frightens or threatens you when you do something wrong", "Likes to spend time with you, for example you sit and laugh together",
"Tries to help you when you are scared or upset", "Shames you in front of your friends when you misbehave",
"Tries to stay away from you", "Complains about you and talks about you behind your back",
"Cares about what you think, and likes you to talk about it",
"Feels other children are better than you are no matter what you do",
"Cares about what you would like when he makes plans", "Lets you do things you think are important, even if it is hard for him",
"Thinks other children behave better than you do", "Wants other people to take care of you (for example, a neighbor or relative)",
"Lets you know you are not wanted", "Is interested in the things you do",
"Shows concern and tries to make you feel better when you are hurt or sick",
"Tells you how ashamed he is when you misbehave", "Lets you know he loves you",
"Treats you gently and with kindness", "Makes you feel ashamed or guilty when you misbehave",
"Tries to make you happy")), .Names = c("id", "item"), row.names = c(NA,
152L), class = "data.frame")
现在制作一个二元组的 tdm，然后删除包含停用词的二元组...
library("RWeka")
library("tm")
library("Matrix")
BigramTokenizer <- function(x) NGramTokenizer(x, Weka_control(min = 2, max = 2))
x <- TermDocumentMatrix(Corpus(VectorSource(text$item)), control = list(tokenize = BigramTokenizer))
# little bit of regex to remove bigrams with stopwords in them, cf. /sf/answers/486340711/
stpwrds <- paste(stopwords("en"), collapse = "|")
x$dimnames$Terms[!grepl(stpwrds, x$dimnames$Terms)]
[1] "cold spells" "else s" "feel free" "feel proud" [5] "feel unloved" "feels free" "lost sleep"
使用软件包附带的停用词库存列表进行删除二元组的快速测试tm表明，它只留下 8 个二元组！显然，我们需要一个较小的停用词列表，因此让我们通过查找此特定语料库中最常见的单词并删除它们来创建自定义列表。
# find freq words in corpus
x <- TermDocumentMatrix(Corpus(VectorSource(text$item)))
# arbitrary choice of 10 occurances = hi freq
mystopwords <- findFreqTerms(x, 10, Inf)
您应该尝试使用 lowfreq 值，我在尝试了几次后将其设置为 10，但其他值可能会更好。
# try to filter the bigrams again with custom stopword list
x <- TermDocumentMatrix(Corpus(VectorSource(text$item)), control = list(tokenize = BigramTokenizer))
# little bit of regex to remove bigrams with mystopwords in them, cf. /sf/answers/486340711/
mystpwrds <- paste(mystopwords, collapse = "|")
# subset tdm to keep only bigrams remaining after mystopwords removed
x <- x[x$dimnames$Terms[!grepl(mystpwrds, x$dimnames$Terms)],]
y <- sparseMatrix( i=x$i, j=x$j, x=x$v,
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