पारंपरिक CLV की गणना करें

# Calculate monthly spend per customer
monthly_revenue = online.___(['CustomerID','InvoiceMonth'])['___'].sum().mean()

# Calculate average monthly retention rate
retention_rate = retention.iloc[:,1:].mean().mean()

# Calculate average monthly churn rate
churn_rate = 1 - ___

# Calculate traditional CLV 
clv_traditional = monthly_revenue * (___ / churn_rate)

# Print traditional CLV and the retention rate values
print('Average traditional CLV is {:.1f} USD at {:.1f} % retention_rate'.format(clv_traditional, retention_rate*100))