Comment by Galen on transforming a continous respond variable into a discrete...
Another example is from my college days studying biotechnology. We would have to count different white blood cells in some prepared samples, and get a close enough answer to the instructor's number....
View ArticleComment by Galen on What are the solutions for small sample in SEM?
A Bayesian SEM would be one way to go, but much of the success of that approach depends on how strong the priors are that you can put on your parameters.
View ArticleComment by Galen on Why are statistics textbook questions so frequently...
@User1865345 It is an interesting perspective. I believe McElreath got the idea from The Golem: What You Should Know About Science, although I have not read it yet.
View ArticleComment by Galen on What is the best method for checking convergence in MCMC?
Some more recent developments can be found in Vehtari et al 2019 and Säilynoja et al 2021.
View ArticleComment by Galen on Can I change values in data from yes and no to binary
^ Ha! Tell me about isomorphism without saying "isomorphism"! (+1)
View ArticleComment by Galen on Is there an English translation of Ladislaus...
Otherwise... It wouldn't kill me to learn some more German. It is just a large investment of time added on top of my other duties.
View ArticleComment by Galen on Problem in PCA plot analysis
You might find linear discriminant analysis worth a try. It will try to find a hyperplane which spans the two groups of data.
View ArticleComment by Galen on Why is Kernel Density Estimation still nonparametric with...
@AdamO Given some of the approximation theory literature I've read, my guess is that if such a non-parametric procedure exists it would have to have an unusual structure (e.g. in terms of geometry or...
View ArticleComment by Galen on Test score equivalence - preparing data for Spearman...
I am not familiar with these various language tests, so I am reacting to your question based on impression. My impression is the Spearman's correlation isn't going to tell you "how closely scores...
View ArticleComment by Galen on Interpreting sub-sample analysis when coefficient signs...
Related to Simpson's paradox: Does Theory of Constraints weigh in on marginal vs conditional bottlenecks?
View ArticleComment by Galen on Can you only apply PCA feature reduction only when there...
@kjetilbhalvorsen I'm not 100% sure what you mean by "helpful", but yes that will be true in at least a couple of ways.
View ArticleComment by Galen on How to correctly get the error of a timeseries mean, when...
How are these $\pm$ values defined/calculated? We should know how they relate to the statistical population in order to understand what can be meaningfully done with them.
View ArticleComment by Galen on How to compare three sets of 'paired' categorical data
I would approach this with a modification of Bayesian Gaussian processes with mixed effects for the distinct samples. The categorical variables could be related to the Gaussian process via a Dirichlet...
View ArticleWhat is the PMF of the Zero-Truncated Skellam distribution?
Vaguely related to the notion of a Lindley equation,I am considering a recurrence$$L_{t+1} := L_t + \max \left( 0, A_t - S_t \right)$$where$$L_t$$is the number of customers in a queue system at time...
View ArticleAnswer by Galen for Forecasting Methods for a Short Time Series with No Trend...
Assuming your inference is correct that there is no trend or seasonality, or any other non-stationarity you can think of, then it sounds like you might benefit from an attempt at modelling this as a...
View ArticleAnswer by Galen for Name of academic field studying geometric structure of...
Wikipedia uses the term "geometric data analysis" but I find that the page hardly scratches the surface, and the examples given seem hodge-podge to me. Let me provide a template for how you might...
View ArticleIs the visit ratio vector non-negative in each of its components?
I am reading the wiki on mean value analysis. I am writing a Python implementation of it, and it occurred to me that I was getting some negative values. I want to validate whether that is expected...
View ArticleAnswer by Galen for Length of a queue
The Real ProblemNear the end of the original post we read:I am waiting up to three days for a company to process my request and wonder why the queue is so long (three days), while obviously processing...
View ArticleAnswer by Galen for Length of a queue
Tyler Ever's answer assumes that we are dealing with an M/M/1, which may not be the case. Otherwise the equation$$L = \frac{\left( \frac{t}{N} \right)^2}{ 1 - \frac{t}{N}}$$(which is a special case of...
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Answer by Galen for What is your favorite "data analysis" cartoon?
Illustration by Julia Suits, author of The Extraordinary Catalog of Peculiar Inventions, and The New Yorker cartoonist.
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