---
title: High / Low Over Time Filter
description: "  ![](https://portfolioboss.com/wp-content/uploads/2022/09/58e67nes6e5_00000.png) ![](https://portfolioboss.com/wp-content/uploads/2022/09/967456b3w45q2_00000.png)   This filter sees whether the *last closing price* is the new high (or the new low) of the specified period, before the instrument can be traded. It can also identify if it's **not**a new high (or **not**a…"
url: "https://portfolioboss.com/documentation/hilo-over-time-filter/"
updated: "2022-09-26"
category: "Chapter 7 - Filters & Rules"
---

# High / Low Over Time Filter

 

![](https://portfolioboss.com/wp-content/uploads/2022/09/58e67nes6e5_00000.png)

![](https://portfolioboss.com/wp-content/uploads/2022/09/967456b3w45q2_00000.png)

 

This filter sees whether the *last closing price* is the new high (or the new low) of the specified period, before the instrument can be traded. It can also identify if it's **not**a new high (or **not**a new low) of the period. Keep in mind this is not about all-time high or all-time low, but just what's seen within the period specified. And it simply looks at the closing prices, not the candles' wicks.

 

![](https://portfolioboss.com/wp-content/uploads/2022/09/r567n456e56njjes_00000.png)

 

Common sense suggests that it's bullish if the instrument makes a new high for the specified period, and bearish if it makes a new low. But it's a *very loose* criteria, so you better use this filter with others that identify trend and momentum.

Note, there's no indicator line plotted for this filter (on the [Instrument Tab](https://portfolioboss.com/documentation/instrument-tab/)), as it's all about the pure price action.

 

---

 

**1.  The first parameter **defines the mode (method) to use this filter.

 

![](https://portfolioboss.com/wp-content/uploads/2022/09/r4567sjn6estna_00000.png)

 

There are four modes:

 

- **New High:** The instrument will be traded only if its last closing price is *the highest* of the period. So all closing prices prior to this last-date (up to the start-date of the period) *must be lower*, no matter what happened be they mountains and valleys; unlike the [ROC](https://portfolioboss.com/documentation/rate-of-change-roc-position-filter/) which simply sees the change between the start date and the end date. This mode is generally good as a Buy Filter.

- **New Low: **The instrument will be traded only if its last closing price is *the lowest* of the period; anything prior to that (up to the start of the period) must be higher. This is usually good as a Sell Filter.

- **No New High: **This one simply sees whether the last closing price **is not **the highest of the period. It doesn't matter how low, sometimes it can even be the lowest of the period; hence it's a very loose criteria that must be supported with other filters. It may look counterintuitive, but our [Divine Engine](https://portfolioboss.com/documentation/the-divine-engine-and-the-boss/) tests showed this mode is actually good as a Buy Filter.

- **No New Low: **This mode identifies if the last closing price is simply **not **the lowest of the period. It doesn't matter how high, as long as it's not the lowest; sometimes it can be the highest of the period.

 

![](https://portfolioboss.com/wp-content/uploads/2022/09/9567456h5bw5na_00000.png)

 

---

 

**2.  The second parameter** defines the *period* (timeframe), *in which* the highest & lowest closing prices are identified (as shown by the pink lines in the screenshot above).

 

![](https://portfolioboss.com/wp-content/uploads/2022/09/t78jdrme6mn6_00000.png)

 

So it's not like this filter identifies *all-time* high and all-time low; there's already [another filter](https://portfolioboss.com/documentation/all-time-high-low-filter/) for that.

Our tests indicate that:

- The mode **New High** (as a Buy Filter) generally performs well with a period of 10 to 30 days.
- The mode **New Low** (as a Sell Filter) generally performs well with a period of 220 to 260 days.
- The mode **No New High** (as a Buy Filter) generally performs well with a period of 250 to 265 days.
- The mode **No** **New Low** (as a Sell Filter) generally performs well with a period of 2 to 15 days.

 

![](https://portfolioboss.com/wp-content/uploads/2022/09/r67y54n64j633w_00000.png)

![](https://portfolioboss.com/wp-content/uploads/2022/09/t674e56h6h5353_00000.png)

 

But as usual, these are just the general values when this filter is used simultaneously as a Buy and a Sell Filter. You *may* need different periods depending on your strategy's portfolio, rules, and other filters used.

 

 

 

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