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Apr
30
comment MCMC converging to a single value?
Do you mean for(j in 1:max(speaker)) or for(j in 1:length(speaker))?
Apr
23
revised Markov chains vs. HMM
edited body
Apr
23
answered Markov chains vs. HMM
Apr
21
comment Using the Weibull curve to model responses from a direct mail campaign. Model isn't fitting the data very well
@tristan: I wouldn't ignore your comment. A gamma curve fits well, including the height and a longer tail. And a plot of the density of the log looks normalish. (I'm not sure where curve-fitting and modeling part ways, though.)
Apr
15
revised Z-score in the analysis of data
added 3 characters in body
Apr
14
answered Z-score in the analysis of data
Apr
9
answered What are the options when statisticians who only know R need more computing speed
Apr
9
reviewed Edit Probability of a consecutive pair of values
Apr
9
revised Probability of a consecutive pair of values
format equations
Apr
7
comment Basic stats question - How to tell if my data distribution is symmetric
@user72943 If you're totally satisfied with it, don't forget to come back and select Glen_b's answer. You might want to wait a little while to see if someone submits a better answer, but Glen_b will receive more credit if you accept the answer.
Apr
6
comment How to best analyze several time series of speed data? Comparing regression analysis?
You need to clarify a bit more what you mean "through a journey". You could use something like "distance in a straight line from the destination", "distance along the (final) path from the destination", or "percentage of the way along the final path", and they have very different meanings when you think of short hops down the coast versus trips across the Pacific. Do you care about things like currents, areas the ship passes through, etc? Should you? (Depends on the conclusions you want to draw and how strong you want them to be.)
Mar
24
awarded  Good Answer
Mar
23
awarded  Caucus
Mar
23
awarded  Constituent
Mar
22
comment Negative real wages and log wages
Are you asking how the log of a number can be negative?
Mar
20
awarded  Popular Question
Mar
18
awarded  Nice Answer
Mar
11
comment Bayesian additive regression trees (BART) for classification analysis of gene expression data
BayesTree is done by the inventors of BART, I believe. But the bartMachine package looks like a better option to me. (The only downside is it requires Java and interfaces to it via the rJava package, which might complicate things if your machine doesn't have Java installed.)
Mar
9
answered Using Kalman filters to impute Missing Values in Time Series
Mar
6
comment What are the disadvantages of using Lasso for feature selection?
@BerkU.: I'm not sure. I was thinking more of the number of tests you'd end up doing -- especially in the case that conjectures talks about where $k$ varies -- which could be so large in comparison to the amount of data you have that you end up overfitting even if you try CV or other techniques that might avoid overfitting in more normal circumstances.