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behrlich

148 karma · joined November 24, 2015

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behrlich··on A bit of math around Cloudflare's R2 pricing model
> For example, customers who are using 25% or more of system resources for longer than 90 seconds would be in violation of our Terms of Service. Please see our Terms of Service or contact us with any questions.

Not really...

behrlich··on Show HN: With a 9-5 job and 2 kids I have finally finished my first MVP
If you had a delta filter I would never use the ITM/OTM setting. It is useful to have the % ITM/OTM in the output, but not as a filter, for my use case.

In case it helps, my normal filter is something like:

- Type: PUT

- Days to expiration: 20 - 40

- Delta: -.30 - -.20

- Open interest: >100

- Premium: >$1

- Underlying price: >$50

- IV: 10% - 30%

That gives me a range of out-of-the-moneyness I'm looking for, but I don't care what the absolute % is.

behrlich··on Kelly Criterion – how to calculate optimal bet sizes
Another word of caution. The Kelly Criterion depends on each event being independent. Lets say I'm told to allocate 50% to QQQ and 50% to SPY. Those may independently be correct, but since the NASDAQ and S&P are highly correlated, this wouldn't be the correct allocation. You've essentially allocated 100% of your portfolio to one probability, rather than 50% to two independent probabilities.

This is an obvious example. But really all stocks (or at least sectors) are correlated just like this. So other examples wouldn't be so obvious.

behrlich··on Ask HN: What are you working on?
DNS isn’t resolving for #2
behrlich··on Stunnel and Airline Wi-Fi
Right. I think all he’s trying to say is that it might be worse to hack something on a plane vs some other kind of computer system. I don’t think they were implying harm was being done to the ap. Colloquially I would definitely call this messing with the ap :)
behrlich··on Stunnel and Airline Wi-Fi
This is almost definitely “hacking” under federal law.
behrlich··on Spurred by Amazon, Supermarkets Try Swapping Cashiers for Cameras
My grocery store has smart scales that let you print a barcode for produce that you can scan at the self checkout line. At the scale you can just search for the product by name (e.g. “apples” will suggest “honey crisp apples”).

There are definitely still issues if you need assistance. The ratio of self checkout lines to attendants is 8/1 when the store is busy.

behrlich··on The End: I can not finish Limit Theory
I've been following this project since 2012. For some reason the kickstarter caught my eye and I've been periodically checking the development forums at least monthly.

This was an absolute journey. He was attempting to make a game engine completely from scratch, including procedurally generated everything, NPC AI's somehow running in this infinite universe all in real time. The demos/screenshots were really beautiful throughout development.

A couple of years ago he had some kind of mental breakdown and stopped updating the forums. When he came back he joined some kind of accelerator and hired a couple of developers.

The project never seemed to evolve beyond engine work. The only "gameplay" was some kind of mini game written for E3 multiple years ago. The most recent updates are months and months of rewriting things back and fourth from lua to C++, infinitely tweaking to make the framerate perfect (at least this is my impression).

For having no stake in this at all - I'm really unreasonably sad about this announcement.

behrlich··on TV advertising has hit a wall thanks to streaming options like Netflix
I've never encountered one of these that wasn't immediately skippable.
behrlich··on Leonardo Da Vinci Painting Sells for $450.3M, Shattering Auction Records
People already pay Gartner a lot of money for just this.
behrlich··on Ethereum from scratch – Part 1: Ping
Bad news! Your site is vulnerable to XSS https://ocalog.com/post/15/

See "OWASP top 10" for getting started with web security.

behrlich··on Robinhood stock trading app confirms $110M raise at $1.3B valuation
The monthly fee for "gold" does seem a bit strange. But it gives you more than just margin. From https://support.robinhood.com/hc/en-us/articles/214681823-In... you also get instant settlement, instant deposit, and extended trading hours, which seems like something worth paying for.

As for "micro loans" - how is this any more predatory than a margin account at any other brokerage?

behrlich··on Jeff Bezos Is Now the World's Second Richest Person
Why do you think that money would have necessarily gone to philanthropy?
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