This is correct. Sadly, the first paragraph of the article contains some glaring errors. "For Markov chains to be effective the current state has to be dependent on the previous state in some way;" This is trivially…
Most statisticians have their own definition of fat-tailed, I like the definition you linked to (polynomial decay), but it is not universally accepted/known. These fat-tailed distributions will have a variance as long…
I also used to work for Erik's (dinkytown location). That was the gross margin on bikes, which I'm pretty sure means (sale price - purchase price)/(purchase price). Correct me if I'm wrong about the formula. Not…
I sort of addressed this in my above comment. Success in academic research, like success in startups, is more dependent on determination than intelligence.
I'm finishing up my PhD this year (haven't set a defense day yet, but I'm aiming for June at this point), and finishing a dissertation requires piles of determination. What I came to realize is that you can't take what…
Possibly. R is really great at doing "fancy" statistical analyses. It's very lousy at doing things like text manipulation. When I have a project that needs some text manipulation on the front end, I frequently use other…
I am a statistician that does both research and applied work. I use R for three reasons: (1) It's Free Software; (2) It's a programming language; (3) Other statisticians use it so it's easier for me to collaborate.…
122,000 seemed absurdly large to me so I just looked up the paper you reference [1]. It looks like there is a calculation error in the paper. The formula they use is n = 16 σ^2 / Δ^2. σ is the standard deviation, and Δ…
Just signed up. But, my main areas of expertise (statistics, e.g. data analysis or mining, modeling or forecasting, designing and analyzing experiments, ...) don't mesh well with your categories. Have you thought about…
You gotta do what you gotta do, but your example probably doesn't do what you want in R. > system.time(vec1 <- rnorm(1000000)) user system elapsed 0.200 0.000 0.199 My computer takes .2 seconds to generate the…
I've added some examples to my above comment. My example is perhaps a little closer to 'median(x <- 10)' than you were asking for, but I think it illustrates the point that using '=' will not always have the desired…
Using '<-' is the general style of the R community. The accepted (but not universal) practice is to use '<-' for assignment and '=' in argument passing. This is a good idea because '<-' and '=' are not…
Speaking as an almost not-amateur (finishing my PhD this year, and working on getting a faculty job), you're both right. Logically, there's nothing wrong with proof by contradiction. As long the steps between "Assume P…
I'm not interpreting your comment as flippant. :) In terms of shortcuts, that would depend on what they were. Some are fine, others are not. E.g. 'borrowing' answers from other students on homework is a shortcut, but…
I'm a 5th year PhD student who is teaching a large (80 student) section of a course, this is the 4th course I've taught. I've also taken plenty of exams as a student, and they are still fresh in mind. I would want to…
I'll start by saying that I'm not trolling. Using conditional probability, or bayes theorem to calculate a conditional probabilitiy, does not make something bayesian analysis. I haven't read the original report (it's on…
This is correct. Sadly, the first paragraph of the article contains some glaring errors. "For Markov chains to be effective the current state has to be dependent on the previous state in some way;" This is trivially…
Most statisticians have their own definition of fat-tailed, I like the definition you linked to (polynomial decay), but it is not universally accepted/known. These fat-tailed distributions will have a variance as long…
I also used to work for Erik's (dinkytown location). That was the gross margin on bikes, which I'm pretty sure means (sale price - purchase price)/(purchase price). Correct me if I'm wrong about the formula. Not…
I sort of addressed this in my above comment. Success in academic research, like success in startups, is more dependent on determination than intelligence.
I'm finishing up my PhD this year (haven't set a defense day yet, but I'm aiming for June at this point), and finishing a dissertation requires piles of determination. What I came to realize is that you can't take what…
Possibly. R is really great at doing "fancy" statistical analyses. It's very lousy at doing things like text manipulation. When I have a project that needs some text manipulation on the front end, I frequently use other…
I am a statistician that does both research and applied work. I use R for three reasons: (1) It's Free Software; (2) It's a programming language; (3) Other statisticians use it so it's easier for me to collaborate.…
122,000 seemed absurdly large to me so I just looked up the paper you reference [1]. It looks like there is a calculation error in the paper. The formula they use is n = 16 σ^2 / Δ^2. σ is the standard deviation, and Δ…
Just signed up. But, my main areas of expertise (statistics, e.g. data analysis or mining, modeling or forecasting, designing and analyzing experiments, ...) don't mesh well with your categories. Have you thought about…
You gotta do what you gotta do, but your example probably doesn't do what you want in R. > system.time(vec1 <- rnorm(1000000)) user system elapsed 0.200 0.000 0.199 My computer takes .2 seconds to generate the…
I've added some examples to my above comment. My example is perhaps a little closer to 'median(x <- 10)' than you were asking for, but I think it illustrates the point that using '=' will not always have the desired…
Using '<-' is the general style of the R community. The accepted (but not universal) practice is to use '<-' for assignment and '=' in argument passing. This is a good idea because '<-' and '=' are not…
Speaking as an almost not-amateur (finishing my PhD this year, and working on getting a faculty job), you're both right. Logically, there's nothing wrong with proof by contradiction. As long the steps between "Assume P…
I'm not interpreting your comment as flippant. :) In terms of shortcuts, that would depend on what they were. Some are fine, others are not. E.g. 'borrowing' answers from other students on homework is a shortcut, but…
I'm a 5th year PhD student who is teaching a large (80 student) section of a course, this is the 4th course I've taught. I've also taken plenty of exams as a student, and they are still fresh in mind. I would want to…
I'll start by saying that I'm not trolling. Using conditional probability, or bayes theorem to calculate a conditional probabilitiy, does not make something bayesian analysis. I haven't read the original report (it's on…