# forge.series

- [highest](/reference/forge/series/highest.md): The highest of the last ``window`` values ending at each bar.
- [lowest](/reference/forge/series/lowest.md): The lowest of the last ``window`` values ending at each bar.
- [rolling](/reference/forge/series/rolling.md): The ``how`` of the last ``window`` values ending at each bar, NaN until ``window`` values
- [shift](/reference/forge/series/shift.md): ``x`` moved ``n`` bars later, so the value at bar ``i`` is ``x[i - n]``.