如何对某个组和某个年份的 DF 进行一些计算答案

【问题标题】：How to do some computations on DF for a certain group and year如何对某个组和某个年份的 DF 进行一些计算
【发布时间】：2021-12-09 16:20:23
【问题描述】：

我有以下数据结构，并想在实现以下计算后绘制一个图： share <- (df[,4]/sum(df[,4]))^2 by year 这样我就可以在同一平面上为每个组绘制两个年度份额图，如下所示（x 和 y 轴的比例是随机选择的）。

（这个叫做HHI指数，我想按年份绘制HHI图的单条趋势线）

你能帮忙吗？

structure(list(kiscode = structure(c("350257", "500607", "351253", 
"320498", "351156", "360252", "360317", "360228", "380911", "381152", 
"310140", "310166", "370274", "310026", "350648", "310123", "350117", 
"380806", "320129", "340251", "370118", "370177", "370150", "360287", 
"360090", "380784", "351350", "370053", "310190", "381160", "380938", 
"380733", "310590", "351067", "310476", "350451", "310174", "340324", 
"310433", "350320", "381250", "310131", "320099", "340154", "320218", 
"350591", "380989", "380954", "380474", "360155", "320293", "350729", 
"320536", "350940", "320242", "380725", "320692", "380377", "370070", 
"320730", "350478", "380407", "370088", "350745", "350354", "350893", 
"370355", "370266", "350281", "320234", "350826", "351245", "330019", 
"350664", "100013", "320102", "350605", "381519", "320234", "320536", 
"381497", "350427", "310476", "370169", "350940", "360090", "380377", 
"320307", "351067", "310239", "380989", "360341", "350672", "320692", 
"381225", "310026", "500607", "380784", "370177", "360279", "350605", 
"320129", "350729", "350893", "351253", "380180", "370150", "350478", 
"350044", "310247", "370070", "381250", "380725", "380644", "350109", 
"350117", "382892", "320242", "351075", "320498", "380938", "360309", 
"350354", "350508", "340251", "310166", "350257", "320099", "381519", 
"350338", "370274", "310425", "340324", "360228", "350826", "380407", 
"320293", "330019", "320684", "351245", "350664", "310433", "310204", 
"380954", "350222", "370118", "320730", "310174", "352691", "351350", 
"350591", "360244", "320218", "380130", "320722", "310123", "351229", 
"320226", "380075", "351202", "380733", "310590", "380911", "350451", 
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"370088", "320706", "350320", "360155", "380458", "310190", "351040", 
"380148", "381160", "350648", "100013", "350281", "351156", "381152", 
"350745", "370053", "360252", "360287", "340154", "350605", "350109", 
"380148", "320684", "350893", "350354", "500607", "350990", "320218", 
"310476"), format.stata = "%6s"), year = structure(c(1980, 1980, 
1980, 1980, 1980, 1980, 1980, 1980, 1980, 1980, 1980, 1980, 1980, 
1980, 1980, 1980, 1980, 1980, 1980, 1980, 1980, 1980, 1980, 1980, 
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1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 
1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 
1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 
1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 
1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 
1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 
1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 1981, 
1981, 1982, 1982, 1982, 1982, 1982, 1982, 1982, 1982, 1982, 1982
), format.stata = "%9.0g"), group = structure(c(0, 0, 0, 1, 
0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 
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1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1, 0, 1, 0, 
0, 1, 0, 0, 0, 1, 1), format.stata = "%8.0g"), asset = structure(c(18285348000, 
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295995241000, 16875791000, 209381233000, 57214594000), format.stata = "%12.0g")), row.names = c(NA, 
-200L), class = c("tbl_df", "tbl", "data.frame"))

【问题讨论】：

5代表的是df[,5]？
请分享您的预期结果，并说明您希望在每个组和每年做什么。
第 5 列，即资产。
这实际上是第 4 列。您的示例甚至没有 5 列，即检查 dim(df) 得到 200 4。
我再说一遍，请分享您的预期数据结果。在当前状态下，您将获得多个值，例如1980 年的第 0 组，然后绘制没有意义。您需要的是每个组/年组合的一个值。但是，这不是您在上面的公式中描述的内容。

标签： r dataframe ggplot2

【解决方案1】：

更新！好的，在谷歌上搜索 hhi （即份额的平方和）后的新尝试。

library(tidyverse)
df_new <- df %>%
  group_by(year, group) %>%
  mutate(share = asset/sum(asset) * 100,
         year = as_factor(year),
         group = as_factor(group)) %>%
  summarize(hhi = sum(share^2))

给出：

# A tibble: 6 x 3
# Groups:   year [3]
  year  group      hhi
  <fct> <fct>    <dbl>
1 1980     0  391.3174
2 1980     1  896.2375
3 1981     0  292.5786
4 1981     1  632.0987
5 1982     0 4134.3289
6 1982     1 4088.3348

然后你可以用：

df_new %>%
 ggplot() +
 geom_line(aes(x = year, y = hhi, group = group, color = group))

【讨论】：

不，我只想按组计算每年的 HHI 指数，然后绘制两条趋势线。
查看您问题下方的评论。请澄清您的预期结果是什么。上面的计算完全符合您的要求。但似乎这不是你想要的，所以请澄清一下。例如。对于 1980 年，第 0 组 - 预期结果是什么？ 1980 年和第 1 组也一样？
对不起，你是对的。也许我错误地输入了公式。所以我修改了公式。然后你能告诉我如何按组绘制吗？
这并没有显着改变结果，它只是将结果缩小了 100 倍。如果您的问题是如何绘制这些数据，请打开一个新问题。也因为完全不清楚 x 和 y 在图中是什么。
x 应该是年份和 y HHI 索引。谢谢