June 2023
Beginner to intermediate
485 pages
9h 43m
Chinese
Content preview from 深入浅出数据分析
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第13章 整理数据 井然有序 409
让我们通过排序更仔细地看看名单中的重复情况。
在R中，通过子集括号中的order函数可以对数据框
架排序。执行下列指令：
由于PersonID域有可能是代表每一个人的特定编号，用它排序再好
不过。毕竟，这些数据中可能不止一个叫做“JohnSmith”的人。
下面，执行head指令看看生成的结果：
hfhhSorted <- hfhh[order(hfhh$PersonID), ]
head(hfhhSorted, n=50)
排序得出的新名单。排序得出的新名单。
为数据排序，让重复
数值集中出现
如果数据量很大，则发现重复数值颇
为不易，给名单排个序的话就容易多了。
Alex
Stu
Sara
Greg
Chris
Jen
Jorge
未排序
Alex
Alex
Alex
Ben
Chris
Chris
Dee
排序
发现这份名单中的重复发现这份名单中的重复
情况颇为不易，尤其是情况颇为不易，尤其是
在名单较长的情况下。在名单较长的情况下。
这儿有大量重复。这儿有大量重复。
很容易看出很容易看出
重复情况。重复情况。
R做了什么？
整理数据
练习
410 深入浅出数据分析
t
用R按照PersonID对数据框架排序后，发现有重复数据吗？
呀！好多重复的呀！好多重复的
名字啊，真乱！名字啊，真乱！
若手头数据非常混乱，就应该大胆地排序 ...
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