226 reputation
17
bio website snowl.net
location Piliscsaba, Hungary
age 31
visits member for 3 years, 8 months
seen May 14 '13 at 20:55

Former assistant professor teaching statistics and Ph.D. candidate in Hungary. Currently full-time founder of rapporter.net, a web application frontend to R-based data analysis and reports. Husband, father of two. I will die before repeating any professional task: we code, then let the machines do the rest.

My R packages: pander, rapport, sandboxR, migration.indices, saves

Please feel free to get in touch (but please do mention your SO username):


May
14
awarded  Caucus
Jul
5
comment Question about basic strategy in Blackjack
Well, if the player has 10+5 and the dealer has a 6 and an ace, I think the dealer could stand.
Jan
12
awarded  Yearling
Jan
10
awarded  Announcer
Sep
18
answered Calculating interquartile range
Jan
18
comment 1D random walk-probability to go back to origin
I am not sure. I must miss something, but with your computation: $P_{1}=\frac{\frac{1}{3}}{\frac{2}{3}}=0.5$. But I think it should be $\frac{1}{3}\cdot\frac{2}{3}+\frac{2}{3}\cdot\frac{1}{3}=0.4444$. What is the problem with my computation?
Jan
18
comment 1D random walk-probability to go back to origin
@Yakov: that sounds tough :) I am trying to work out a solution, but see no easy way. Till then, please see my edited answer above, that may help finding the way.
Jan
18
revised 1D random walk-probability to go back to origin
Added "simulation"
Jan
18
answered 1D random walk-probability to go back to origin
Jan
18
answered how can we generate random numbers using skew normal distribution in multivariate case
Jan
16
comment Question about basic strategy in Blackjack
@picakhu: yes, I do, as blackjack can be played with only one deck also. The number of decks in play only affects the probability of getting a card what have been seen before (what I left out of my example, as I stated), which is not a very big deal in blackjack - not like in poker. Also, 4+ decks in play serves the purpose of making more difficult counting the cards (so: cheat), and also the ease: as the dealer do not have to shuffle the deck every turn. And of course also increases the house edge. In your example, the prob. is so high, that more decks do not make tangible difference.
Jan
16
awarded  Editor
Jan
16
comment Question about basic strategy in Blackjack
I added a concrete example to my answer based on your comment, I hope you meant something like this.
Jan
16
revised Question about basic strategy in Blackjack
Added details to the answer
Jan
15
answered Question about basic strategy in Blackjack
Jan
14
comment How many possible solutions for 6 wires?
@bradenkeith - factorial, see e.g. on Wikipedia (en.wikipedia.org/wiki/Factorial)
Jan
14
answered How many possible solutions for 6 wires?
Jan
13
comment skew normal distribution
By this way you will get a distribution with a skewness atound 0.850965 as computed at your corresponding question at stackoverflow (look for the link above).
Jan
12
awarded  Supporter
Jan
12
comment Given an infinite number of monkeys and an infinite amount of time, would one of them write Hamlet?
@Ross Millikan: "this is a very large number, but most numbers are larger" -> why would I accept this statement insted of "most numbers are smaller"?