ประเมินผลตอบแทน

# Calculate the effect of our portfolio selection on a hypothetical $1k investment
cash = 1000
algo_cash, spy_cash = [cash], ____  # set equal starting cash amounts
for r in test_returns:
    cash *= 1 + r
    algo_cash.append(cash)

# Calculate performance for SPY
cash = 1000  # reset cash amount
for r in returns_monthly['SPY'].iloc[train_size:]:
    cash ____ ____
    ____

print('algo returns:', (algo_cash[-1] - algo_cash[0]) / algo_cash[0])
print('SPY returns:', (spy_cash[-1] - spy_cash[0]) / spy_cash[0])