所以我有一个包含四列的数据框:课程ID,用户ID,日期(一个整数)和累计积分接收。我想要做的是,对于每个用户课程对,请使用lowess
来平滑课程中所有日期的累积分数。 lowess
函数需要一个向量,应用平滑算法,然后返回两个向量x
和y
...我只对y
向量感兴趣。在数据框上聚合lowess()
我的第一个想法是
aggregate(df$CumulativePointsReceived,
list(df$UserID, df$CourseID),
function(x) lowess(x)$y)
但是,它返回一个基本不可用数据帧,其中第三列是这些向量的列表。我想要的是一个与输入df完全相同的数据框,但每个用户 - 课程日都有一列平滑点值。我确信有一个非循环的方式来做到这一点,但我似乎无法以正确的方式思考。在此先感谢...
这是df中的第一个用户 - 课程对的dput。我本可以投入更多,但是对于每个用户课程来说,它会变得很愚蠢,并且会有110天的时间。
structure(list(CourseID = c(6567146L, 6567146L, 6567146L, 6567146L,
6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L,
6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L,
6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L,
6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L,
6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L,
6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L,
6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L,
6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L,
6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L,
6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L,
6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L,
6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L,
6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L,
6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L,
6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L, 6567146L,
6567146L), UserID = c(4759679L, 4759679L, 4759679L, 4759679L,
4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L,
4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L,
4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L,
4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L,
4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L,
4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L,
4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L,
4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L,
4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L,
4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L,
4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L,
4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L,
4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L,
4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L,
4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L, 4759679L,
4759679L), DayInCourse = 1:110, CumulativePointsReceived = c(0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 47, 47, 47, 47, 47, 47, 47, 47,
47, 47, 47, 47, 47, 107, 107, 107, 107, 107, 107, 107, 107, 107,
107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107,
107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107,
107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107,
107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107,
107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107,
107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107, 107)), .Names = c("CourseID",
"UserID", "DayInCourse", "CumulativePointsReceived"), row.names = c(46085L,
46118L, 46120L, 46133L, 46102L, 46086L, 46182L, 46184L, 46159L,
46139L, 46088L, 46090L, 46144L, 46161L, 46187L, 46113L, 46177L,
46193L, 46151L, 46143L, 46126L, 46121L, 46104L, 46170L, 46128L,
46131L, 46167L, 46098L, 46127L, 46178L, 46101L, 46129L, 46152L,
46175L, 46093L, 46122L, 46096L, 46136L, 46106L, 46116L, 46148L,
46173L, 46189L, 46117L, 46172L, 46162L, 46164L, 46108L, 46091L,
46112L, 46135L, 46181L, 46190L, 46171L, 46169L, 46100L, 46141L,
46103L, 46168L, 46110L, 46107L, 46089L, 46154L, 46165L, 46125L,
46163L, 46147L, 46166L, 46183L, 46160L, 46150L, 46097L, 46115L,
46157L, 46194L, 46138L, 46188L, 46153L, 46155L, 46179L, 46180L,
46191L, 46095L, 46176L, 46111L, 46105L, 46142L, 46087L, 46109L,
46158L, 46145L, 46114L, 46192L, 46140L, 46146L, 46174L, 46094L,
46124L, 46149L, 46119L, 46186L, 46130L, 46134L, 46156L, 46185L,
46099L, 46123L, 46137L, 46132L, 46092L), class = "data.frame")
我不得不将'drop = T'添加到'split'调用中,因为并不是每个用户都需要使用每一个课程,而'lowess'不能处理一个空的'x',但这对我很有用!非常感谢。 –