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Visualizing transaction data is a critical step in fraud detection for banks. By transforming raw transaction records into clear visual representations, you can spot unusual patterns—such as sudden spikes in amounts or frequent activity at odd hours—that may indicate fraudulent behavior. Visualization helps you and compliance teams quickly interpret complex datasets, making it easier to identify anomalies that automated systems or manual review might miss.


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import pandas as pd
import matplotlib.pyplot as plt

# Example transaction data
data = {
    "date": pd.date_range(start="2024-01-01", periods=30, freq="D"),
    "amount": [200, 220, 250, 210, 205, 4000, 230, 240, 235, 210,
               215, 220, 225, 5000, 230, 210, 215, 210, 215, 220,
               7000, 225, 230, 235, 240, 245, 250, 255, 260, 265]
}
df = pd.DataFrame(data)

plt.figure(figsize=(10, 5))
plt.scatter(df["date"], df["amount"], color="blue")
plt.title("Transaction Amounts Over Time")
plt.xlabel("Date")
plt.ylabel("Transaction Amount ($)")
plt.xticks(rotation=45)
plt.tight_layout()
plt.show()

Scatter plots like the one above allow you to visually inspect transaction amounts across time. Large spikes or clusters of unusually high transactions can quickly draw your attention to periods that may warrant further investigation for potential fraud.

Boxplots are another valuable visualization tool for analyzing transaction data. They provide a summary of the distribution of transaction amounts, highlighting the median, quartiles, and especially outliers. Outliers—points that fall outside the expected range—are often the first sign of suspicious activity, such as unusually large withdrawals or deposits that deviate from a customer's normal behavior.


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import seaborn as sns

# Example data with customer IDs
customer_data = {
    "customer_id": ["A", "A", "A", "A", "A", "B", "B", "B", "B", "B"],
    "amount": [200, 210, 205, 4000, 220, 230, 235, 7000, 245, 250]
}
df_customers = pd.DataFrame(customer_data)

plt.figure(figsize=(6, 4))
sns.boxplot(x="customer_id", y="amount", data=df_customers)
plt.title("Transaction Amounts by Customer")
plt.xlabel("Customer ID")
plt.ylabel("Transaction Amount ($)")
plt.tight_layout()
plt.show()

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Abschnitt 3. Kapitel 4

Visualizing Transaction Patterns for Fraud Detection

1. How can scatter plots help in fraud detection?

2. What does an outlier in a boxplot represent in transaction data?

3. Why is visualization a useful tool for compliance teams?