r - 警告信息 : Removed 4 rows containing missing values (geom_path) 的含义

Question

数据:https://drive.google.com/file/d/0B20HmmYd0lsFSmZhYUk3bkRTNFk/edit?usp=sharing

plot.df<- read.table("meansses.txt")

theme_luke <- function (base_size = 12, base_family = "") {
theme_gray(base_size = base_size, base_family = base_family) %+replace% 
theme(
  panel.background = element_rect(fill="white"),
  panel.grid.minor.y = element_blank(),
  legend.key = element_rect(fill="white", colour= "white"),
  strip.background = element_rect(fill="white")
)   
}
theme_set(theme_luke())

ggplot(plot.df, aes(factor(L2),mean)) + 
 geom_point(stat = "identity",aes(shape=L3), size=4, group=L3) +
 scale_shape(solid = FALSE) +
 geom_errorbar(aes(ymax = mean + se, ymin = mean - se)) +
 facet_grid(. ~ L1) +
 xlab("Levels") + ylab("Proportion") +
 ylim(0,0.12)

一切正常，除非我设置 ylim我得到

Warning message:
Removed 4 rows containing missing values (geom_path) .

有人可以向我解释在这种情况下这意味着什么吗？

Answer 1

警告意味着某些元素因超出指定范围而被删除。在您的情况下，所有点都在范围内，但一个误差条不在范围内。