R中的加权频率表

Question

我希望在 R 中为某个变量 (INTERVIEW_DAY) 创建一个频率表，但考虑到另一个变量作为权重 (WEIGHT)。

我试图用包data.table做到这data.table 。 不过，我很想用 R-Base 包来做。

下面你会找到我想要的表格类型，但仍然没有加权，这就是我想要学习的。

数据（变量 TUCASEID、INTERVIEW_DAY 和 WEIGHT）：

TUCASEID INTERVIEW_DAY    WEIGHT
1  2.00301e+13             5 8155462.7
2  2.00301e+13             6 1735322.5
3  2.00301e+13             6 3830527.5
4  2.00301e+13             4 6622023.0
5  2.00301e+13             4 3068387.3
6  2.00301e+13             4 3455424.9
7  2.00301e+13             1 1637826.3
8  2.00301e+13             2 6574426.8
9  2.00301e+13             6 1528296.3
10 2.00301e+13             4 4277052.8
11 2.00301e+13             6 1961482.3
12 2.00301e+13             7  505227.2
13 2.00301e+13             6 2135476.8
14 2.00301e+13             3 5366309.3
15 2.00301e+13             6 1058351.1

使用打包的 data.table 创建表：

df <- setDT(df)
df_freq_table <- df[,.(Freq = .N), by = INTERVIEW_DAY][, Prop := Freq / sum(Freq)][, Cum := cumsum(100 * Prop / sum(Prop))]

我的输出：df_freq_table[]

 INTERVIEW_DAY Freq       Prop        Cum
1:             5    1 0.06666667   6.666667
2:             6    6 0.40000000  46.666667
3:             4    4 0.26666667  73.333333
4:             1    1 0.06666667  80.000000
5:             2    1 0.06666667  86.666667
6:             7    1 0.06666667  93.333333
7:             3    1 0.06666667 100.000000

Answer 1

在base R ，我们可以使用xtabs/prop.table 。 根据 OP 的代码， cumsum是根据 'INTERVIEW_DAY' 中唯一值的出现顺序计算的。 因此，要避免sort ING基于整数值，皈依factor与levels规定，获得sum “重量”通过“INTERVIEW_DAY”与xtabs ，使用prop.table返回的比例，然后应用cumsum上输出

df$INTERVIEW_DAY <- factor(df$INTERVIEW_DAY, levels = unique(df$INTERVIEW_DAY))
tbl1 <- xtabs(WEIGHT ~ INTERVIEW_DAY, df)
Prop <- prop.table(tbl1)
Cum <- cumsum(100 * Prop / sum(Prop))
Cum
#        5         6         4         1         2         7         3 
# 15.71029  39.30705  72.86967  76.02470  88.68935  89.66260 100.00000 

out <- data.frame(INTERVIEW_DAY = names(tbl1), Freq = as.numeric(tbl1),
            Prop = as.numeric(Prop), Cum = as.numeric(Cum))
row.names(out) <- NULL
out
#  INTERVIEW_DAY       Freq        Prop       Cum
#1             5  8155462.7 0.157102906  15.71029
#2             6 12249456.5 0.235967631  39.30705
#3             4 17422888.0 0.335626124  72.86967
#4             1  1637826.3 0.031550297  76.02470
#5             2  6574426.8 0.126646592  88.68935
#6             7   505227.2 0.009732453  89.66260
#7             3  5366309.3 0.103373998 100.00000

---

如果我们需要加权频率，请使用count

library(dplyr)
df %>% 
  mutate(INTERVIEW_DAY = factor(INTERVIEW_DAY, levels = unique(INTERVIEW_DAY))) %>%
  count(INTERVIEW_DAY, wt = WEIGHT, sort = FALSE) %>% 
  mutate(Prop = n / sum(n),
         Cum = cumsum(100 * Prop/sum(Prop)))
# A tibble: 7 x 4
#  INTERVIEW_DAY         n    Prop   Cum
#  <fct>             <dbl>   <dbl> <dbl>
#1 5              8155463. 0.157    15.7
#2 6             12249456. 0.236    39.3
#3 4             17422888  0.336    72.9
#4 1              1637826. 0.0316   76.0
#5 2              6574427. 0.127    88.7
#6 7               505227. 0.00973  89.7
#7 3              5366309. 0.103   100. 

---

或者使用data.table

library(data.table)
setDT(df)[, .(Freq = sum(WEIGHT)), by = INTERVIEW_DAY
  ][, Prop := Freq / sum(Freq)][, Cum := cumsum(100 * Prop / sum(Prop))][]
#  INTERVIEW_DAY       Freq        Prop       Cum
#1:             5  8155462.7 0.157102906  15.71029
#2:             6 12249456.5 0.235967631  39.30705
#3:             4 17422888.0 0.335626124  72.86967
#4:             1  1637826.3 0.031550297  76.02470
#5:             2  6574426.8 0.126646592  88.68935
#6:             7   505227.2 0.009732453  89.66260
#7:             3  5366309.3 0.103373998 100.00000

数据

df <- structure(list(TUCASEID = c(2.00301e+13, 2.00301e+13, 2.00301e+13, 
2.00301e+13, 2.00301e+13, 2.00301e+13, 2.00301e+13, 2.00301e+13, 
2.00301e+13, 2.00301e+13, 2.00301e+13, 2.00301e+13, 2.00301e+13, 
2.00301e+13, 2.00301e+13), INTERVIEW_DAY = c(5L, 6L, 6L, 4L, 
4L, 4L, 1L, 2L, 6L, 4L, 6L, 7L, 6L, 3L, 6L), WEIGHT = c(8155462.7, 
1735322.5, 3830527.5, 6622023, 3068387.3, 3455424.9, 1637826.3, 
6574426.8, 1528296.3, 4277052.8, 1961482.3, 505227.2, 2135476.8, 
5366309.3, 1058351.1)), class = "data.frame", row.names = c("1", 
"2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", 
"14", "15"))