jibiki

18 ms·

121.
by jibiki 17y ago
I can only hope that the article was written by one of Professor Fischer's students, rather than the professor himself :)
122.
by jibiki 17y ago
He meant if they are the same variable, not the same value. (E.g., you pass pointers to your function.) int swap(int * a, int * b) { (*a)^=(*b); (*b)^=(*a); (*a)^=(*b); } int x = 15; int *y = &x; int *z =
123.
by jibiki 17y ago
The writing style is very odd. It begins normally, but the second half or so is written in a high-school-student-esque manner. The last paragraph actually begins with the words "in conclusion"(!) It's as if the author had started to writ
124.
by jibiki 17y ago
But grocery stores cost money! I don't think Alex can simultaneously claim: 1. A million-odd dollars in savings by the age of 22 by forgoing public education 2. An education by the age of 22 At very least, it requires some justification.
125.
by jibiki 17y ago
http://www.amazon.com/s?ie=UTF8&search-type=ss&index...
126.
by jibiki 17y ago
Thanks, those are great. "A bell rings every 25 minutes while another bell rings every 40 minutes. Suppose they rang together at 6 a.m., when will they ring together again?" Very cute. Do you find that students prefer such problems to the
127.
by jibiki 17y ago
> I find I can reliably challenge most advanced math students in the United States just by serving them problems from grade-level standard curriculum textbooks from Singapore. If it's not asking too much, can you give some examples? Ar
128.
by jibiki 17y ago
Yep. Here's a really good example from EY: http://lesswrong.com/lw/kw/the_tragedy_of_group_selectionism... "The mathematical conditions for group selection overcoming individual selection were too extreme to be found in Nature. Why not
129.
by jibiki 17y ago
Modern medicine is largely built on advances made in non-medical fields like physics, chemistry and engineering, no? (E.g., it would be harder to do medicine without electricity.) So I would expect advances in those fields to be crucial to
130.
by jibiki 17y ago
I imagine that they set it to English to take the photos?
131.
by jibiki 17y ago
That's pretty much the right answer. Let's say all tests cost the same and are 99% specific. Test X is at least 70% sensitive. Test Y and Z have unknown sensitivity.
132.
by jibiki 17y ago
Let's say X and Y are both good tests. Is it still possible you would prefer Z to Y?
133.
Quiz HN: Test your biases
4 points by jibiki 17y ago|7 comments
134.
by jibiki 17y ago
> Claiming that these 30 acceptance / rejection regions will somehow be independent of each other isn't true -- since our tests are accurate, or at least reasonably so, the accept / reject regions will be the same, or nearly so. Ok, her
135.
by jibiki 17y ago
Ok, here's my null hypothesis: the election is not rigged. We are going to assume that this null hypothesis is true. Now, we run 30 tests on the data. What is the probability that at least two tests reject the null hypothesis with 95% co
136.
by jibiki 17y ago
> The question was: What is the chance of being able to find exactly 2 tests Sure thing. That's: (30 choose 2) * (.95^28) * (.05^2) = 0.258636738 I thought you meant "at least two tests", for obvious reasons. (If 4 tests sho
137.
by jibiki 17y ago
It's easier to compute the probability that less than 2 tests report a value of 5%. This is: (30 choose 0)*(.95^30) + (30 choose 1)*(.95^29)*(.05^1) = 0.553542075 So there's about a 50-50 chance (obviously I'm assuming that the t
138.
by jibiki 17y ago
For real? People have always told me that recommendations are pretty much the only thing good grad schools look at. (For math, at least.)
139.
by jibiki 17y ago
As far as I can tell, Watt didn't make any money off the scheme.
140.
by jibiki 17y ago
In case you are really, really curious: http://news.ycombinator.com/item?id=520422 So he does forensics, as it were.
141.
by jibiki 17y ago
It is hypothesized that Earth's atmosphere initially contained much higher % C02. "Based on today's volcanic evidence, this atmosphere would have contained 80% water vapor, 10% carbon dioxide, 5 to 7% hydrogen-sulfur, and smaller amounts of
142.
Ask HN: Bug?
7 points by jibiki 17y ago|6 comments
143.
by jibiki 17y ago
> Physicians do not routinely gives patients placebo (except in research), nor would it be ethical to do so routinely in clinical practice. Wikipedia says otherwise (and here is its source): http://www.ncbi.nlm.nih.gov/sites/entrez?cmd
144.
by jibiki 17y ago
So this guy is being evaluated by a psychiatrist. The psychiatrist shows him an inkblot and asks, "what does this look like to you?" "Sex," the guy says. So the psychiatrist shows him another one. "That looks like sex too," says the guy.
145.
by jibiki 17y ago
It's the sort of humor typified by: http://www.bash.org/?5300
146.
by jibiki 17y ago
It's hard to find actual data on this. Here are the radio licensing fees, most seem to be in the $500 to $5000 range. http://www.fcc.gov/fees/am_fm_2008.pdf This page suggests TV broadcast license fees up to ~$70,000, but it's not at all
147.
by jibiki 17y ago
I don't know about that, I think it's good that someone is looking at the risks of runaway AI and similar things. Progress relies upon a certain diversity of thought, and that means that some people (and nearly all scientists) will end up
148.
by jibiki 17y ago
It's Eliezer's website, and friendly AI is kind of his thing. This link is long but entertaining: http://lesswrong.com/lw/qk/that_alien_message/ Here's another good one, although it doesn't seem to tell the whole story (he lost two of th
149.
by jibiki 17y ago
Yes, they get their bound by counting inversions. This is much better than the method I suggested in the other thread (which, of course, doesn't actually work.)
150.
by jibiki 17y ago
Each element can be swapped at most once with each other element. So the number of swaps is less than n choose 2, i.e., quadratic. (This does not mean that the run time is quadratic, since pairs can be chosen multiple times, and left al

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