我正在尝试使用R复制Fama French 1993论文。我需要进行以下排序:
数据生成:
set.seed(1234)
n = 120
stocks <- c("A", "B", "C", "D", "E")
exchange <- c("NYSE", "NASDAQ", "AMEX")
df <- as.data.frame(cbind(Month = 1:12,
exchangeCode = exchange[round(runif(n, 1, 3))],
Stock = stocks[round(runif(n, 1, 5))],
ME=floor(100*abs(rnorm(n)))))
期望的输出:
ME_NYSE_vals <- as.numeric(paste(df[df$Month==1 & df$exchangeCode=="NYSE","ME"]))
ME_ALL_vals <- as.numeric(paste(df[df$Month==1,"ME"]))
cut(x = ME_ALL_vals,
breaks = c(-Inf,quantile(ME_NYSE_vals,probs=seq(.1,.9,.1)),+Inf),
labels = 1:10
)
应根据ME_NSYE_vals计算休息时间。剪切应该应用于每个月的所有ME_ALL_vals。
答案 0 :(得分:1)
如果目的是保留整个数据框但仅为 NYSE 值生成十分位数,则下面的代码可以执行。关键是仅为与 NYSE 值相关的条目生成十分位数,但要保持完整数据集实现某种形式的部分排序。
# Libs
Vectorize(require)(package = c("dplyr", "magrittr"),
character.only = TRUE)
# Transformations
df %<>%
mutate(nTileNYSE = ifelse(exchangeCode == "NYSE", ntile(ME, 10), NA))
arrange(nTileNYSE)
代码已应用于数据:
set.seed(1)
df <- as.data.frame(cbind(exchangeCode = c("NYSE", "NASDAQ"),
Stock = c("A", "B", "C", "A"),
Month = 1:12,
ME=rnorm(1200)))
根据评论中的讨论,我建议采用以下方法:
# Libs --------------------------------------------------------------------
Vectorize(require)(package = c( "tidyr", "dplyr", "magrittr", "xts", "Hmisc"),
char = TRUE)
# Data generation ---------------------------------------------------------
set.seed(1234)
n = 120
stocks <- c("A", "B", "C", "D", "E")
exchange <- c("NYSE", "NASDAQ", "AMEX")
df <- as.data.frame(cbind(Month = 1:12,
exchangeCode = exchange[round(runif(n, 1, 3))],
Stock = stocks[round(runif(n, 1, 5))],
ME = floor(100*abs(rnorm(n)))))
# Transformations ---------------------------------------------------------
# For some reason this was needed
df$ME <- as.numeric(as.character(df$ME))
# Generate cuts
dfNtiles <- df %>%
arrange(exchangeCode, Month, ME) %>%
group_by(exchangeCode, Month) %>%
mutate(cutsBsdOnNYSE = cut(x = ME,
breaks = cut2(x = df$ME[df$exchangeCode == "NYSE"],
g = 10, onlycuts = TRUE))) %>%
ungroup() %>%
group_by(cutsBsdOnNYSE) %>%
mutate(grpBsdOnNYSE = n())
这很简单
为获得的组编号,以便创建组标识符
归结为: