如何计算特定国家/地区的利润中位数 [英] How to calculate median of profits for a particular country

问题描述

大家好， 我是R的新手，正在尝试在数据框中计算特定国家/地区的利润中位数.我尝试了一个国家/地区以下的收入，但对我而言不起作用.

Hello folks, I am new to R and I am trying to compute median profit for a particular country in a data frame.I tried below one but it doesn't work for me.

data("Forbes2000", package = "HSAUR")
median(Forbes2000[,"sales","country"="United States"])

推荐答案

median(Forbes2000$sales[Forbes2000$country == "United States"])

尽管不知道您的数据框是什么样子很难确定.如果您想获取一个包含每个国家(而不是一个国家)中位数的data.frame，则可以执行以下操作:

Though it's hard to be certain without knowing what your data frame looks like. If you want to get a data.frame with the median of every country instead of just one, you could do:

library(plyr)
ddply(Forbes2000, "country", function(d) median(d$sales))

(您必须首先安装 plyr 软件包，例如，通过执行install.packages("plyr"))

(You would have to install the plyr package first, for example by doing install.packages("plyr")).

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