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the blog of l.arrieta

the blog of l.arrieta

this is where i document the useless and unimportant things that i enjoy: poetry, travel, books (the classics), photos, surfing, science, cats

"daily standard deviation of 1% moves 1% a day" - not so

In the financial markets, the definition of volatility is assumed to be standard deviation. However, in practice, people seem to either forget the definition or completely substitute it with the mean absolute deviation. For example...

placing high-confidence bets in mediocristan and winning

life in Mediocristan is quite enjoyable. It reminds me of Lawrence Durrell's Alexandria. The ocean is nearby, and the climate is pleasant. Never too cold, never too hot.

shorting stocks based on fragility

shorting stocks based on fragility

On principle, therefore, a small short position is in order. Small because we cannot time markets, and small because it's an expression of a philosophical view, not an attempt to make fuck you money with one trade.

dying a good death and reading antifragile

dying a good death and reading antifragile

against my (acquired) skepticism of anything published in the last 50 years (exceptions: Kazuo Ishiguro's novels, The Selfish Gene), I picked up Nassim N. Taleb's Antifragile.

basic hiking gear (2025)

basic hiking gear (2025)

nowadays our hikes are frequent, easy, and short. We drive long distances to reach the trailhead, and typically do not make it to the main attraction (the waterfall, the pool, the giant sequoia), but we do have lots of fun.

All writings

Recommendations

rick beato, a man with taste

rick beato, a man with taste

"music is composed of melody, harmony, and rhythm... and these days many of the popular songs are rhythm only." (Charly Garcia)

mediocre amateur

mediocre amateur

trail running, hiking, climbing, skiing, and travel we’re not experts we’re amateurs.

james popsys

james popsys

james's photos have a unique mood in them, like when I was looking at the full moon in my last camping trip

cojudeces.com

cojudeces.com

descubre al cojudazo que llevas dentro!

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