Lære Integrating External Data with Accounting Records | Retrieving and Reporting Financial Data

Integrating external market data with your company's accounting records can provide a deeper, more contextual understanding of financial performance. By combining stock prices, interest rates, or industry indicators with internal transaction data, you can better assess how market movements influence your organization's assets, liabilities, and overall financial health. This integration supports more informed decision-making, improved risk management, and the ability to benchmark performance against external factors.


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import pandas as pd

# Example internal transaction records
transactions = pd.DataFrame({
    "date": ["2024-06-01", "2024-06-02", "2024-06-03"],
    "ticker": ["AAPL", "AAPL", "AAPL"],
    "shares": [10, 5, 8]
})

# Example external stock price data
stock_prices = pd.DataFrame({
    "date": ["2024-06-01", "2024-06-02", "2024-06-03"],
    "AAPL_price": [190, 193, 192]
})

# Merge on the 'date' column
merged = pd.merge(transactions, stock_prices, on="date", how="left")
print(merged)

When integrating data from different sources, it is essential to align records by date, since both internal transactions and external market data are typically time-based. The merge method in pandas is commonly used for this purpose. Sometimes, you may encounter missing values if, for example, there is no market data for a specific transaction date. You can address missing values using methods like fillna() to substitute them with appropriate defaults or interpolate missing data, ensuring your analysis remains consistent and reliable.


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import pandas as pd

# Company holdings on specific dates
holdings = pd.DataFrame({
    "date": ["2024-06-01", "2024-06-02", "2024-06-03"],
    "shares": [10, 15, 23]
})

# Corresponding external market prices
stock_prices = pd.DataFrame({
    "date": ["2024-06-01", "2024-06-02", "2024-06-03"],
    "price": [190, 193, 192]
})

# Merge and calculate market value
merged = pd.merge(holdings, stock_prices, on="date", how="left")
merged["market_value"] = merged["shares"] * merged["price"]
print(merged[["date", "market_value"]])

1. Why might an accountant want to integrate external financial data with internal records?

2. What pandas method is commonly used to align data from different sources?

3. Fill in the blanks to merge and align two DataFrames on a date column.

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