blahblah3

10 ms·

31.
by blahblah3 10y ago
“A high test score tells you only that a person has high ability and is a good match for that particular test at that point in time,” says Matthews. I have never understood the intention behind this type of statement (which I've seen
32.
by blahblah3 10y ago
you're trying to explain high levels of skill with only one factor: hours of "focused effort of the right kind" in reality, inherent talent clearly plays a very strong role. As a crude illustration, suppose math_skill = hours
33.
by blahblah3 10y ago
This really hurts the talented kids with less educated parents. Educated or well-off parents can always supplement with lessons at home or supplementary school (kumon)
34.
by blahblah3 10y ago
even companies with little intrinsic value (i.e no ability to generate future cash flows for shareholders) can trade at high valuations for a long time (see the tulip mania)
35.
by blahblah3 11y ago
I find it concerning that this much damage can be done by just a few individuals. You can't just look at the number of deaths. Saying that terrorist attacks barely impact P(death) trivializes them.
36.
by blahblah3 11y ago
The markets have been pricing in a higher risk of recession in the past few months. Financials have been hit very hard which is one signal of this
37.
by blahblah3 11y ago
I would argue that the p-value way of reasoning (probability of something happening given a hypothesis) corresponds to an intuitive way many people reason about probability. For example, suppose the police are investigating the robbery of a
38.
by blahblah3 11y ago
Yeah I may have worded it confusingly, you can think of H as the null hypothesis in the equation (or replace it all with not H if you want)
39.
by blahblah3 11y ago
I was describing the theory behind the p-value. In practice, people slice and dice the dataset in multiple ways and try several specifications which increases the false positive rate (see the multiple comparisons problem)
40.
by blahblah3 11y ago
The point of p-values is to limit false positive rates. If you only accept results with p-value <= 0.05, your false positive rate is at most 5%. Of course, if you had apriori knowledge that everything was a "null result" , then
41.
by blahblah3 11y ago
here's a proof that the ratio of the triangle area to the square is scale invariant: imagine covering a geometric shape with a bunch of little squares, each with side length s. you could imagine a limit argument, with the squares getti
42.
by blahblah3 11y ago
Even if at some point humans no longer had any edge, by pure randomness some of them would still have really good performance. So even in a perfectly efficient market you wouldn't expect humans to be taken over.
43.
by blahblah3 11y ago
Not a paradox...here is a proof that it is 1/3 Let P(T) = probability that coin landed on tails, P(H) = probability that coin landed on heads. Let "1st" denote the event that it is the first time you are awaken, "2nd&quo
44.
by blahblah3 11y ago
Wow connecting cars to the internet? Sounds insanely dangerous. Not everything should be connected to the internet or "smart".
45.
by blahblah3 11y ago
well hedging could lower your expected value but increase your sharpe ratio (i.e lower the variance relative to reward).
46.
by blahblah3 11y ago
the transition from pure math to the application of statistics to the real world (or science) requires a philosophical adjustment. In math, the model and axioms are sound (by definition) within the mathematician's world. However, in or
47.
by blahblah3 11y ago
"Tests are written by people and their biases recognized or unrecognized will end up in tests" Honestly I have an extremely hard time imagining how math exams are gender biased. Have you even taken a look at this year or past imo&
48.
by blahblah3 11y ago
Let p be the percentage of water and m the total mass. Then m(p) = 1/(1-p) . The "unintuitive" aspect is that we want to think of this function as linear when it isn't. By taylor's theorem, how bad a linear approxim
49.
by blahblah3 11y ago
okay but the less you allocate to your "one winner" the less your portfolio return will benefit from that winner.
50.
by blahblah3 11y ago
if you make too many bets you'll dilute your edge. if you make too few bets then you are exposed to too much idiosyncratic risk. so people have to find the right balance
51.
by blahblah3 11y ago
the difference here is that the label on the green box is explicitly "challenged" by the label of the red box. the step is to realize that both labels should be challenged (i.e if the label on the green box doesn't have to be
52.
by blahblah3 11y ago
haha indeed an "annoying" trick. we're so conditioned to reading phrases like "exactly one of the labels is true" as meta-information that we forget it's a "box label".
53.
by blahblah3 11y ago
college is definitely too expensive and few would pay that much money just for the info gained from coursework (any of the coursework...not just cs). it also seems counterproductive that society expects everybody to go to college. unfortuna
54.
by blahblah3 11y ago
I always feel like I'm in a tiny minority when reading people talk about the practical irrelevance of cs coursework at universities. I loved learning the theoretical aspects of cs, discrete math and algorithms, compilers, using haskell
55.
by blahblah3 11y ago
I recommend generatingfunctionology by herbert wilf for the interested. The beautiful idea here is to consider formal power series (encoding sequences of values in polynomials without demanding convergence) https://en.wikipedia.o
56.
by blahblah3 11y ago
this seems like it is extremely prone to overfitting to noise...especially with only 4000 observations in your sample it is very easy to find seemingly profitable strategies in backtesting (even outsample) by just tinkering with a few param
57.
by blahblah3 11y ago
It sounds like the problem may have been to convert a min heap to a max heap?
58.
by blahblah3 11y ago
that doesn't mean the interview question was bad, presumably in the actual google interview they defined the problem. people are confused because he didn't define "invert" in the twitter post
59.
by blahblah3 11y ago
very cool article although to a layman I would try to answer "what is code" more simply: code is just instructions. instructions for how to tie a windsor knot or cook a recipe or play a piano piece can be thought of as "code&
60.
by blahblah3 11y ago
i'm not exactly sure either, too bad he didnt define "invert". i based my comment on the only thing I could find: https://wwwx.cs.unc.edu/~duozhao/entry/2014/12/binary-tree-u... this is on

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