s</code>: Reduce the data frame of investors'
transactions by aggregating those transactions that happened within
a time interval.</p></li>
<li><p><code>clean_transactions</code>: Clean the data frame of investors'
transactions.</p></li>
<li><p><code>aggregate_market_prices</code>: Aggregate the data frame of market prices
with a specific aggregate function within a time interval.</p></li>
<li><p><code>subset_market_prices</code>: Subset the data frame of market prices
based on investor's traded assets and 