# Volume and volatility > Use the usual daily range to place a stop outside everyday noise and size the position from it, and see what volume can and cannot confirm. - Course: [Trading Basics: How It Works, How Not to Lose Everything](https://productovi.com/courses/trading.md) - Module: Which tools are worth my time? - Lesson 23/32, ~26 min - Source: https://productovi.com/courses/trading/volume-and-volatility ## Calm share, jumpy share **Alex Tutor:** Back on your Pebble practice account, today's question is practical: how far away should a stop be? A stop, which you may have met in the risk module, is an order that closes the trade at a price where your idea is wrong. **Nora:** I always put my stop 40 cents below my entry. Small stop, small loss. And somehow I get stopped out all the time, then the price goes my way without me. ![On a bumpy path, bouncing pebbles knock over Nora's flag planted right behind her, while Marc's flag stands far back; Alex watches with a phone.](https://productovi.com/courses/trading/diagrams/m6-l3-scene.png) **Alex Tutor:** Then let's measure the noise. The same 20 days, 2026-03-02 to 2026-03-27, for two Pebble shares: calm Northwind Foods and jumpy Bluefin Energy. **Dataset (CSV):** [Northwind Foods, 20 daily candles](https://productovi.com/datasets/trading/volume-and-volatility/m6_nwf_recent.csv) Practice market data on Pebble. Prices in dollars, volume in shares. **Dataset (CSV):** [Bluefin Energy, the same 20 days](https://productovi.com/datasets/trading/volume-and-volatility/m6_bfe_recent.csv) Practice market data on Pebble. Prices in dollars, volume in shares. **Alex Tutor:** **Volatility** is how much a price usually moves. One plain measure: the **average daily range**, the average of high minus low over recent days. For Northwind Foods the 20 ranges add up to 6.69 dollars. **Alex Tutor:** Before any arithmetic: what exactly does that number describe? > **Exercise:** What does a share's average daily range describe? **Sofia:** 6.69 divided by 20 is about 0.33 a day. **Alex Tutor:** Right. Now Bluefin Energy: its 20 ranges add up to 23.78. > **Exercise:** Bluefin Energy's 20 daily ranges (high − low) add up to 23.78 dollars. What is its average daily range over these 20 days? Round to cents. ## A stop inside the noise **Marc:** Here's a quick check. On how many of the 20 days did the price dip at least 40 cents below that day's open? A 40-cent stop under the open would have been hit on those days. **Alex Tutor:** Northwind Foods: 2 days out of 20. Bluefin Energy: 10 days out of 20. Half of all ordinary days would have knocked out Nora's stop on Bluefin Energy, with no news and no change in the story. **Nora:** So my stops weren't wrong about the market. They were just too close for that share. > **Exercise:** Why did Nora's 40-cent stop keep getting hit on Bluefin Energy? ## Wider stop, smaller position **Alex Tutor:** One common approach: place the stop about two usual daily ranges away, or beyond a level, whichever makes sense for the plan. For Bluefin Energy, 2 × 1.19 = 2.38. **Nora:** But 2.38 a share is a huge loss! **Alex Tutor:** Not if you buy fewer shares. Keep the dollar risk fixed: 1% of 10,000 is 100 dollars, minus about 3 dollars of costs. Shares = 97 ÷ stop distance, rounded down. > **Exercise:** With the stop 2.38 away on Bluefin Energy and 97 dollars to risk after costs, how many shares can you buy? Round down. **Alex Tutor:** Now the calm share. Same 97 dollars, a stop two usual ranges away. How many shares? > **Exercise:** Northwind Foods' average daily range is about 0.33, so a stop two ranges away is 0.66. With 97 dollars to risk after costs, how many shares can you buy? Round down. **Marc:** Same 100 dollars at risk on both shares. The jumpy one simply gets fewer shares. And a gap past the stop can still make the loss bigger, so this is a plan, not a guarantee. ## What volume can and can't say **Nora:** And volume? On 2026-03-18 Bluefin Energy jumped to 47.89 on 254,922 shares, more than double its usual. Doesn't big volume confirm the move? **Alex Tutor:** **Volume** counts how many shares changed hands. Every share bought was sold by someone. Big volume shows lots of interest and that orders could fill easily. It doesn't show who was right. **Sofia:** And three days later? **Alex Tutor:** The close was 46.88, below the spike day's 47.89. The average volume over the 20 days was 106,524. This time the busy day was followed by a fall; another time it might not be. One example proves nothing either way. > **Exercise:** A day with very high volume confirms that the price will keep moving in that day's direction. **Nora:** So what do you use volume for, Marc? **Marc:** Two things. Very low volume warns me that the spread may be wide and my order may fill badly. A sudden spike tells me something happened, so I read the news before I touch anything. **Alex Tutor:** Both are about trading conditions, not direction. That's a fair job for volume. **Alex Tutor:** So pick the honest job for volume from these four. > **Exercise:** A share on Pebble trades only a few thousand shares a day, far below its usual volume. What is a fair way to use that? > **Exercise:** Match each idea with what it is good for. **Alex Tutor:** Now help Nora fix her habit. **Nora:** Short version, please. I'm listening. **Marc:** Numbers first, then the rule. > **Exercise:** Nora wants to keep her 40-cent stop on Bluefin Energy "because a small stop means a small loss". In 2–3 sentences, explain with the numbers what goes wrong and what she could do instead. > **Key ideas** > > - **Volatility**: how much a price usually moves. **Average daily range** = average of high − low: Northwind Foods 0.33, Bluefin Energy 1.19. > - A stop inside the usual range gets hit by noise: a 40-cent stop under the open would have been hit on 10 of 20 Bluefin days. > - Put the stop outside the noise (for example about two ranges, 2.38) and keep the dollar risk fixed: 97 ÷ 2.38 → 40 shares. > - **Volume** shows how many shares changed hands, not who was right. A gap can still jump past any stop. > **Educational, not advice** > > This course explains how trading works; it never tells you what to buy or sell. Most people who trade lose money, and you can lose all of it. For taxes and rules, ask a licensed professional where you live. - Previous lesson: [A momentum gauge and the overbought myth](https://productovi.com/courses/trading/momentum-gauge.md) - Next lesson: [Case: choose at most three tools](https://productovi.com/courses/trading/choose-your-tools.md) --- Productovi Learning. Free, no sign-up needed to read.