Exploring US baby name trends
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Basic strategy: split-apply-combine and how to use ddply
(plyr package)
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代码链接: http://rpubs.com/xshi0001/378154
data: bnames.csv(https://pan.baidu.com/s/1Y0U_so6_qdLc_tsbqR0zUw)
ddply
(plyr package)本文标题:R- split-apply-combine (exercise
本文链接:https://www.haomeiwen.com/subject/jdxwhftx.html
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