One-period log returns to multi-period log returns

Calculates k-period log return series from one-period log return series using the following formula:
r(k) = r_1+r_2+...+r_k

Missing values are treated as zeros.

Required extensions:
- KNIME Quick Forms (https://hub.knime.com/knime/extensions/org.knime.features.js.quickforms/latest)

Input ports

1. Type: Table
   One-period log return series
   One or more numeric columns. Each selected column is interpreted as one-period log return series.

Output ports

1. Type: Table
   k-period log return series
   k-period log return series calculated using the one-period log return series and window length k that are provided in the input.