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如何识别每个群集中的序列?

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使用作为 TraMineR 的一部分的生物燃料数据集:

library(TraMineR)
data(biofam)
lab <- c("P","L","M","LM","C","LC","LMC","D")
biofam.seq <- seqdef(biofam[,10:25], states=lab)
head(biofam.seq)
     Sequence                                    
1167 P-P-P-P-P-P-P-P-P-LM-LMC-LMC-LMC-LMC-LMC-LMC
514  P-L-L-L-L-L-L-L-L-L-L-LM-LMC-LMC-LMC-LMC    
1013 P-P-P-P-P-P-P-L-L-L-L-L-LM-LMC-LMC-LMC      
275  P-P-P-P-P-L-L-L-L-L-L-L-L-L-L-L             
2580 P-P-P-P-P-L-L-L-L-L-L-L-L-LMC-LMC-LMC       
773  P-P-P-P-P-P-P-P-P-P-P-P-P-P-P-P

我可以执行聚类分析:

library(cluster)
couts <- seqsubm(biofam.seq, method = "TRATE")
biofam.om <- seqdist(biofam.seq, method = "OM", indel = 3, sm = couts)
clusterward <- agnes(biofam.om, diss = TRUE, method = "ward")
cluster3 <- cutree(clusterward, k = 3)
cluster3 <- factor(cluster3, labels = c("Type 1", "Type 2", "Type 3"))

但是,在此过程中,来自biofam.seq的唯一ID已被数字1到N的列表所取代:

head(cluster3, 10)
[1] Type 1 Type 2 Type 2 Type 2 Type 2 Type 3 Type 3 Type 2 Type 1
[10] Type 2
Levels: Type 1 Type 2 Type 3

现在,我想知道每个簇中哪些序列,以便我可以应用其他函数来获得每个簇内的平均长度,熵,子序列,不相似性等 . 我需要做的是:

  • 将旧ID映射到新ID

  • 将每个簇中的序列插入到单独的序列对象中

  • 在每个新序列对象上运行我想要的统计信息

如何在上面的列表中完成2和3?

2 回答

  • 1

    我想这会回答你的问题 . 我使用了我在这里找到的代码http://www.bristol.ac.uk/cmm/software/support/workshops/materials/solutions-to-r.pdf来创建 biofam.seq ,因为你所建议的都没有为我工作 .

    # create data
    library(TraMineR)
    data(biofam)
    bf.states  <- c("Parent", "Left", "Married", "Left/Married", "Child",
                    "Left/Child", "Left/Married/Child", "Divorced")
    bf.shortlab <- c("P","L","M","LM","C","LC", "LMC", "D")
    biofam.seq  <- seqdef(biofam[, 10:25], states = bf.shortlab,
                                           labels = bf.states)
    
    # cluster
    library(cluster)
    couts <- seqsubm(biofam.seq, method = "TRATE")
    biofam.om <- seqdist(biofam.seq, method = "OM", indel = 3, sm = couts)
    clusterward <- agnes(biofam.om, diss = TRUE, method = "ward")
    cluster3 <- cutree(clusterward, k = 3)
    cluster3 <- factor(cluster3, labels = c("Type 1", "Type 2", "Type 3"))
    

    首先,我使用 split 为每个集群创建索引列表,然后我在 lapply 循环中使用它来创建 biofam.seq 的子序列列表:

    # create a list of sequences
    idx.list <- split(seq_len(nrow(biofam)), cluster3)
    seq.list <- lapply(idx.list, function(idx)biofam.seq[idx, ])
    

    最后,您可以使用 lapplysapply 对每个子序列运行分析

    # compute statistics on each sub-sequence (just an example)
    cluster.sizes <- sapply(seq.list, FUN = nrow)
    

    其中 FUN 可以是您通常在单个序列上运行的任何函数 .

  • 1

    例如,可以简单地获得第一簇的状态序列对象

    bio1.seq <- biofam.seq[cluster3=="Type 1",]
    summary(bio1.seq)
    

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