Cognitive Bias - In Me, In the Analysis, or Not at All?
A seed of doubt arose when I paid attention to the recommendations for the companies I follow on Inderes. I follow 24 stocks on Inderes. These have accumulated over the years, and additions or removals are rare; the vast majority of companies have been on my watchlist for over a year.
Inderes’ general overview shows the stock’s 52-week price range. I don’t normally pay attention to this when I determine a stock to be “cheap” or “expensive” based on entirely different criteria than how its price has fluctuated during the year. That’s why I was a bit surprised, as this metric is not something I follow or consider significant, that with strong emphasis:
- A stock whose price is below its 52-week average receives an “add” or “buy” recommendation.
- Stocks that are above their 52-week average predominantly receive a “reduce” or “sell” recommendation.
Out of the 24 stocks I follow, only 4 behave differently from this pattern. Delving into analyses and fundamentals feels a bit pointless if there’s a cognitive bias that would allow one to identify whether a stock belongs in the “buy” or “sell” category just by glancing at the 52-week price range – and be right with a high probability :).
This could absolutely be pure coincidence – no scientific study can be built on a single data point (this day and these units), but just for Saturday’s entertainment, I asked AI about bias in general terms:
Gambler’s fallacy (the belief that “a series must even out”) and hot-hand fallacy (the belief that “a streak will continue”) are well-known cognitive distortions. At the roulette table, after a series of reds, some of us tend to believe that red is “hot,” and some tend to believe that the series must break and it’s worth betting on black.
Mechanically random processes (roulette): people statistically bet “against” more often after a long streak → gambler’s fallacy dominates. In field observations at roulette tables, after a streak of 5–6 of the same color, up to ~85% of bets were against the streak.
Human performance (sports): the belief in continuation is more common (hot-hand). A classic basketball study long claimed that there was no “hot hand,” but a later statistical correction shows a small but real positive correlation.
Stock markets: both are visible in the data – but on different timescales. Based on investment data, continuation (momentum) is on average “stronger” over a 3–12 month horizon; reversal is emphasized over very short and long timeframes.
How do Inderes’ analysts identify potential cognitive biases? The analysis surely relies on various facts and statistical methods, so that final touch in a borderline case – do I lean towards “add” or “reduce” when one must be chosen – is this perhaps unconsciously influencing the thinking in the background?
Have a nice weekend everyone!
Stocks I follow: Detection Technology, Talenom, Orion, F-Secure, Terveystalo, Enento Group, Kemira, SRV Group, Sampo, UPM-Kymmene, Metso, Valmet, Canatu, Wärtsilä, Nokia, Admicom, Nokian Tyres, Kone, Aiforia Technologies, Qt Group, Tietoevry, Remedy Entertainment, Neste, Witted Megacorp