R：改变x轴在森林图刻度标记

Question

library(forestplot) 
# Cochrane data from the 'rmeta'-package 
cochrane_from_rmeta <- 
    structure(list(
    mean = c(NA, NA, 0.578, 0.165, 0.246, 0.700, 0.348, 0.139, 1.017, NA, 0.531), 
    lower = c(NA, NA, 0.372, 0.018, 0.072, 0.333, 0.083, 0.016, 0.365, NA, 0.386), 
    upper = c(NA, NA, 0.898, 1.517, 0.833, 1.474, 1.455, 1.209, 2.831, NA, 0.731)), 
    .Names = c("mean", "lower", "upper"), 
    row.names = c(NA, -11L), 
    class = "data.frame") 

tabletext<-cbind(
    c("", "Study", "Auckland", "Block", 
    "Doran", "Gamsu", "Morrison", "Papageorgiou", 
    "Tauesch", NA, "Summary"), 
    c("Deaths", "(steroid)", "36", "1", 
    "4", "14", "3", "1", 
    "8", NA, NA), 
    c("Deaths", "(placebo)", "60", "5", 
    "11", "20", "7", "7", 
    "10", NA, NA), 
    c("", "OR", "0.58", "0.16", 
    "0.25", "0.70", "0.35", "0.14", 
    "1.02", NA, "0.53")) 

forestplot(tabletext, 
      cochrane_from_rmeta,new_page = TRUE, 
      is.summary=c(TRUE,TRUE,rep(FALSE,8),TRUE), 
      clip=c(0.1,2.5), 
      xlog=TRUE, 
      col=fpColors(box="royalblue",line="darkblue", summary="royalblue")) 

我有一个森林图，以及我的x轴的刻度标记标签有点奇怪隔开，并且我想将其变更为具有每个刻度标记彼此相距0.1。另外，有没有人知道forestplot如何决定蜱的间隔？

Answer 1

从forestplot文档（https://cran.r-project.org/web/packages/forestplot/vignettes/forestplot.html#ticks-and-grids），您有两个选项。

1. 您可以手动设置您的forestplot()表达式，例如， xticks = c(-.1, -0.05, 0, .05)
2. 您可以创建一个序列，例如， xticks <- seq(from = -0.08, to = 2.50, by = 0.1)并将其添加到您的forestplot()表达式中xticks = xticks