如果您使用forestplot R軟件包，如何添加腳註？

Question

請原諒我這個天真的問題，因爲我是R的新手。我使用我在R博客上看到和改編的代碼生成了一個森林情節。我想添加一個腳註，但我不知道如何去做。我見過不同的代碼，但我不知道哪一個是合適的。任何意見非常感謝！謝謝！

森林情節代碼如下：

library(ggplot2) 
library(grid) 
library(gridExtra) 
library(xtable) 
library(plyr)   
library(MASS)  
library(reshape2) 

d1 <- read.csv("/view/name_view/vob/folder/subfolder/forestTAF.csv", stringsAsFactors=FALSE) 

#Format data so column labels and columns match required graphical output 
subgps <- c(4,5,8,9,12,13,16,17,20,21,24,25,28,29) 

#Combine the rest of the columns in the table 
tabletext <- cbind(c("Change due to", d1$Variable), 
       c("PK Measures", d1$PK.Measures), 
       c("Recommendation", d1$Recommendation)) 

#Load forestplot package 
library(forestplot) 

#Create forest plot 
png(filename="forestTAF.png",width=1600, height=640) 
forestplot(labeltext=tabletext, graph.pos=3, align=c("l", "c", "l"), 
     mean=c(NA,d1$Point.Estimate), 
     lower=c(NA,d1$Low), upper=c(NA,d1$High), 
     title="Drugname \nFold Change and 90% CI", 
     xlab="Change Relative to Reference (i.e., without interaction)", 
      txt_gp=fpTxtGp(label=gpar(cex=1.25), 
          ticks=gpar(cex=1.1), 
          xlab=gpar(cex = 1.2), 
          title=gpar(cex = 1.2)), 
     col=fpColors(box="black", lines="black"), 
     zero=1, cex=0.9, lineheight = "auto", boxsize=0.5, colgap=unit(6,"mm"), 
     lwd.ci=2, ci.vertices=TRUE, ci.vertices.height = 0.4) 

Answer 1

grid::gridtext是一種選擇

library('forestplot') 

## ?forestplot 

row_names <- list(list("test = 1", expression(test >= 2))) 
test_data <- data.frame(coef=c(1.59, 1.24), 
         low=c(1.4, 0.78), 
         high=c(1.8, 1.55)) 
forestplot(row_names, test_data$coef, test_data$low, test_data$high, 
      zero = 1, cex = 2, lineheight = "auto", xlab = "Lab axis txt") 

grid::grid.text其中"npc"在grid::unit是歸一化的座標0,1這樣0.05將橫跨5％圖片

x <- unit(.05, 'npc') 
y <- unit(.05, 'npc') 
grid.text('A footnote', x, y, gp = gpar(fontsize=10, font = 3)) 

或者，您可以使用grid::grid.locator，它允許您指向並點擊您想要的位置。

g <- grid.locator('npc') 
grid.text('A footnote', g$x, g$y, gp = gpar(fontsize=10, font = 3))