Brick sampling changes what a volatility envelope can show

Sampling by brick size instead of clock time

A brick series of a given calendar window usually contains fewer bricks than a time-bar series of the same window, because quiet or sideways stretches can be absorbed into a single brick.

A brick-aware volatility envelope was specified so that band width can still expand and contract when the chart is built from equal-size bricks instead of equal-time bars. On a Renko chart, bricks replace equal-time bars, so the same sampling change applies.

On a brick chart, a conventional volatility envelope can fail to make those width changes visible, which is the stated reason a separate envelope construction was introduced.

How the published envelope is built

One published construction sets the upper envelope from a weighted average plus that average scaled by an average true range term, and the lower envelope from the same average minus a reduced-range term.

The same construction also plots a separately smoothed typical-price midline, so the envelope and the moving-average support and resistance line are not forced to share one lookback.

The brick-aware envelope was demonstrated on a mean-brick S&P 500 chart and on an average-true-range range chart of a currency pair, showing that the study was meant to travel across both brick and range sampling.

Different questions about channels

A side-by-side comparison treats the brick-aware envelope as a tracker of both price and brick structure, and treats classic deviation bands as the more volatility-sensitive locator of sideways, well-defined channels.

Editorial note: in that comparison, Bollinger Bands are the classic deviation-band reading. They are used to locate a sideways, well-defined channel. The brick-aware envelope is used to follow price together with the brick structure that remains after quiet stretches have been absorbed.

Support and resistance on a separate average

A complementary moving-average reading treats repeated tests of an average as support or resistance in a continuing trend, and treats a break through one or more averages as a candidate reversal condition.

Because the midline is smoothed separately from the envelope, that support and resistance reading can use a different lookback from the band width. Editorial note: the archive presents this as a complementary reading, not as a replacement for the envelope.