Lære Visualizing Statistical Data

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When analyzing statistical data, visualization is a powerful tool for understanding distributions, spotting patterns, and communicating findings. Three foundational visualization techniques you will use frequently are histograms, boxplots, and scatter plots. Each serves a distinct purpose and helps you interpret data in different ways.

A histogram displays the distribution of a single numerical variable by grouping data into bins and showing the frequency of observations in each bin. This makes it easy to spot skewness, modality, and outliers in your data.

A boxplot (or box-and-whisker plot) summarizes the distribution of a variable by showing its median, quartiles, and potential outliers. Boxplots are particularly useful for comparing the spread and central tendency of a variable across several groups.

A scatter plot visualizes the relationship between two numerical variables. By plotting one variable on the x-axis and another on the y-axis, you can quickly assess correlation, trends, and potential clusters or outliers.

Choosing the right visualization depends on your analysis goals:

Use a histogram to understand the overall shape and spread of a single variable;
Use a boxplot to compare distributions across categories or to highlight outliers;
Use a scatter plot to explore relationships or associations between two continuous variables.

Interpreting these visualizations allows you to make informed decisions about further statistical analysis or modeling.


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import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
import seaborn as sns

# Generate a sample DataFrame
np.random.seed(42)
data = pd.DataFrame({
    "score": np.random.normal(loc=75, scale=10, size=200),
    "group": np.random.choice(["A", "B"], size=200),
    "hours_studied": np.random.normal(loc=5, scale=2, size=200)
})

# Histogram: Distribution of scores
plt.figure(figsize=(6, 4))
sns.histplot(data["score"], bins=20, kde=True)
plt.title("Histogram of Scores")
plt.xlabel("Score")
plt.ylabel("Frequency")
plt.show()

# Boxplot: Scores by group
plt.figure(figsize=(6, 4))
sns.boxplot(x="group", y="score", data=data)
plt.title("Boxplot of Scores by Group")
plt.xlabel("Group")
plt.ylabel("Score")
plt.show()

# Scatter plot: Hours studied vs. score
plt.figure(figsize=(6, 4))
sns.scatterplot(x="hours_studied", y="score", hue="group", data=data)
plt.title("Scatter Plot of Hours Studied vs. Score")
plt.xlabel("Hours Studied")
plt.ylabel("Score")
plt.show()

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