使用ggplot2绘制直方图报错：StatBin需连续x变量，如何统计频次？

Hey there! Let's figure out why your code gave that error and how to fix it so you can see how often each number (like 3, 5, etc.) shows up in your frequency column.

First, two key issues with your original code:

• You wrapped "frequency" in quotes inside aes()—this tells ggplot to treat it as a plain text string instead of referencing the actual column in your data frame t.
• geom_histogram() is designed for continuous numerical data (like measurements that can be any value, not just whole integers), but your frequency values are discrete whole numbers. That's exactly why R suggested using stat="count".

Quick Fix: Use geom_bar() Directly #

The simplest way to count occurrences of each value in your frequency column is to use geom_bar(), which automatically counts discrete x-values by default. Here's the corrected code:

library(ggplot2)
ggplot(t, aes(x = frequency)) + 
  geom_bar(fill = "steelblue", color = "black") +
  labs(
    title = "How Often Each Frequency Value Appears",
    x = "Frequency Value",
    y = "Number of Occurrences"
  ) +
  theme_minimal()

Alternative: Pre-Summarize Your Data First (With dplyr) #

If you want to explicitly calculate the counts before plotting (great for inspecting the raw numbers), use the dplyr package to summarize your data:

library(ggplot2)
library(dplyr)

# Calculate how many times each frequency value occurs
frequency_summary <- t %>%
  group_by(frequency) %>%
  summarize(occurrences = n())

# Plot the summarized results
ggplot(frequency_summary, aes(x = frequency, y = occurrences)) +
  geom_col(fill = "coral", color = "black") +
  labs(
    title = "How Often Each Frequency Value Appears",
    x = "Frequency Value",
    y = "Number of Occurrences"
  ) +
  theme_minimal()

Quick Check: Ensure frequency is Numeric #

If your frequency column is stored as text (instead of numbers), the plots might not behave correctly. Verify its type with:

class(t$frequency)

If it returns "character", convert it to numeric first:

t$frequency <- as.numeric(t$frequency)

内容的提问来源于stack exchange，提问作者Max Mustermann