Yes, I've said many times that the only useful information from a chart is momentum, but that you could get a better signal of momentum using an excel spreadsheet. E.g. if you base your decisions on a spreadsheet it'd be more in-line with your rules than your visual review.
This is the basic concept behind momentum and stock price autocorrelation. And the best way to measure it is through the rate of change (e.g. period new / period old -1) applied to price and volume. Does that make sense? That is literally the definition of what you are saying.
Now, as to whether or not a strategy around that is profitable, is a different story. A review of the literature (papers on the topic) reflect an expectation of a positive but time varying return from momentum. So sometimes this strategy works and sometimes it doesn't.
This means that sometimes buying a stock that is increasing in price and volume underperforms.
No it's the same, let me explain.
Basic idea of momentum strategy:
- buy stock seeing new high conditional on rising volume
Minervini
claims that he follows a process which includes:
- Trend
- More specifically, price uptrend
- Fundamentals
- Superperformance stocks (superperformance phases in stocks) are driven by better earnings, revenue, and margins.
- This improvement usually starts before the superperformance phase, but continues within it.
- Catalyst
- The big winners have a catalyst which drives institutional interest.
- This could be a drug approval, a new product or a big contract, or a new CEO.
- He cites Blackberry, Apple and Google as examples.
- Entry points
- Mark doesn’t explain here how to find these, but simply states that most super performers have at least one low-risk entry point.
- Exit points
- Not all trades will work out.
- So you need a stop loss to force you out of losing positions in order to protect your account.
- You also need to identify the end of the super performance stage in order to sell at a profit.
This process was super popular back in the 90s. Nowadays it is not sufficient to find a stock with "super performance" characteristics, because the slow diffusion of information has largely gone away. In the chart I posted previously of stocks with Top 20% or top 5% sales and EPS growth, the performance was lackluster and did not beat the benchmark. This means that adding this to the process doesn't make sense.
Catalysts are a true thing -- these are informational events. Permanent stock price change (e.g. from non-random traders, also known as informed trading) occur from information on future cash flows or discount rates. Big public catalysts however are already priced in, so at the time of catalyst you are 50/50. That's why there's that adage of "buy the rumor sell the news". This is another step in the process that doesn't make sense.
Long story short, Minervini claims to use a process that was decent in the 90s. It's clear he doesn't use it anymore because almost all of his twitter stuff is technical and his interview snafu shows he didn't review the company or have a catalyst. He doesn't his process because it no longer is enough to make money. In the 90s it might have done ok, but still hard vs wall street folks with more resources. Nowadays that is like using Thalesian physics to build a rocket.
Side note: Thales was a greek philosopher who believed all matter was created from water -- from his works is where the term physics came from
So tl;dr his "process" doesn't exist anymore and would probably underperform the S&P.
Protecting capital and making sure that my portfolio reflects my views. My rule is that positions need to be matched to a view that is active. A stock my lose, but if it's within it's standard deviation it's not a big deal, unless there is information about cash flows or discount rates.