I have a problem involving a collection of continuous probability distribution functions, most of which are determined empirically (e.g. departure times, transit times). What I need is some way of taking two of these PDFs and doing arithmetic on them. E.g. if I have two values x taken from PDF X, and y taken from PDF Y, I need to get t...
So, I am writing some sort of a statistics program (actually I am redesign it to something more elegant) and I though I should use a language that was created for that kind of stuff (dealing with huge data of stats, connections between them and some short of genetic/neural programming). To tell you the truth, I just want an excuse to d...
Is it possible to get statistics about each users contributions, total line count etc? ...
Whatever its merits, Adobe's Actionscript 3 presents what may be a unique opportunity to explore the consequences of typed versus untyped languages, because it is pretty much a strict superset of javascript, with all the syntactic benefits/overhead of strict type declarations, declarative casting, etc. What this makes possible is compar...
I have a Rails application where users can set up their domains and publish content onto them. I need to collect public traffic statistics such as pageview count etc. One good example of this feature is flickr usage statistics i can see as a customer. The question is what is the best way to collect usage information. Should it be done b...
I have a value type that represents a gaussian distribution: struct Gauss { double mean; double variance; } I would like to perform an integral over a series of these values: Gauss eulerIntegrate(double dt, Gauss iv, Gauss[] values) { Gauss r = iv; foreach (Gauss v in values) { r += v*dt; } return r; }...
For a project I have a specification with formulas, I have to implement. In these formulas a cumulative standard normal distribution function exists, that takes a float and outputs a probability. The function is symbolized by a Φ. Exists a Java-library, that computes this function? ...
We have several different optimization algorithms that produce a different result for each run. For example the goal of the optimization could be to find the minimum of a function, where 0 is the global minima. The optimization runs returns data like this: [0.1, 0.1321, 0.0921, 0.012, 0.4] Which is quite close to the global minima, so...
Hi, Simple question, but I haven't found a good explanation on google. When using Set Statistics IO ON, the logical reads and scan count is provided in the message window of management studio. If I have: tblExample, scan count 5, logical reads 20 What does scan count signify? ...
I was wondering if there is a good statistical library for Java. I used to use colt from CERN but it does not provide a good weighted sampling. So I usually use MATLAB Java Builder and export everything to Java afterward. Any thoughts or insights? ...
I've been looking for a good testing framework for months, not finding anything, so I've just been building my own. This is what I want to do: - track arbitrary behaviors (e.g. # of photos viewed, # of comments posted) - track correlation between arbitrary variables and those behaviors (e.g, how do different versions of this prompt af...
Per version (1.0,1.1,2.0,3.0,3.5) how many classes are in the .NET framework? I am looking for the info for a presentation that I'm going to give for a class in my Master's program. ...
My language is PHP, but the algorithm should be fairly universal. I have an associative array of (let's say) ratings and number of times that rating has been given. $ratings = array( 1 => 1, 2 => 3, 3 => 6, 4 => 3, 5 => 3 ); This is the equivalent of: [1, 2, 2, 2, 3, 3, 3, 3, 3, 3, 4, 4, 4, 5, 5, 5], but given the...
I would like to learn some SAS because I am interested in a few industries that tend to use it exclusively. However, I don't want to get stuck with a resource that assumes I know nothing about statistical programming. Is there a good guide for programmers with statistics experience in R? Thanks, Steven ...
What do you call an Average that does not include outliers? for example if you have a set: {90,89,92,91,5} avg = 73.4 but excluding the outlier (5) we have {90,89,92,91(,5)} avg = 90.5 How do you describe this average in statistics? ...
What is statistical debugging? I haven't found a clear, concise explanation yet, but the term certainly sounds impressive. Is it just a research topic, or is it being used somewhere, for actual development? In other words: Will it help me find bugs in my program? ...
I have a database table with hundreds of thousands of forum posts, and I would like to find out what hour-long period contains the most number of posts. I could crawl forward one minute at a time, keeping an array of timestamps and keeping track of what hour had the most in it, but I feel like there is a much better way to do this. I wi...
Hi all, I'm currently trying to verify whether or not, given an unsorted array A of length N and an integer k, whether there exists some element that occurs n/k times or more. My thinking for this problem was to compute the mode and then compare this to n/k. However, I don't know how to compute this mode quickly. My final result needs t...
I noticed that Joel Spolsky repeatedly estimated the worldwide number of developers at 4 million in the Stackoverflow podcast. So, how many developers do the different platforms, such as Java, .NET/Windows, Flash, PHP, Python, Ruby etc., really have? This article puts Windows developers at 6 million, comment no. 2 in this article claim...
I'm developing a website with a custom search function and I want to collect statistics on what the users search for. It is not a full text search of the website content, but rather a search for companies with search modes like: by company name by area code by provided services ... How to design the database for storing statistics ...