I am trying to do some statistical analysis of different A/B tests to see which alternative is better and have found conflicting information about this. First, I am interested in a couple different things: Tests that measure success by counting events, such as conversions or emails sent Tests that measure success by counting revenue T...
I have a requirement to calculate the average of a very large set of doubles (10^9 values). The sum of the values exceeds the upper bound of a double, so does anyone know any neat little tricks for calculating an average that doesn't require also calculating the sum? I am using Java 1.5. ...
Is there any benefit to running an UPDATE Statistics after you create an index or is it done automatically for you? ...
What are some advantages and disadvantages to doing statistical analyses in SciPy vs. R? They seem to have been designed with opposite philosophies (plain old library vs. DSL). What are some rules of thumb about which is the right tool for the job? ...
I've recently been assigned the task of updating a "legacy" database (previously managed by an ex-coworker who left the company a while ago). The new database has the exact same structure as the previous one; the only difference is in the content itself, as this database now has more recent data. The problem is that the old database ha...
I'm reading http://lse.sourceforge.net/locking/dcache/dcache%5Flock.html, in which spinlock time for each functions is measured: SPINLOCKS HOLD WAIT UTIL CON MEAN( MAX ) MEAN( MAX )(% CPU) TOTAL NOWAIT SPIN RJECT NAME 5.3% 16.5% 0.6us(2787us) 5.0us(3094us)(0.89%) 15069563 83.5% 16.5% 0% dcache_...
Hi Happy Holidays. I am not sure what is the best way to deal with this. I want to display page views and user views (How many unique users viewed a page). Is there a plugin for this? login_count is of course easy to check though. Just not sure about views. Google Analytics does the job well but I don't know whether it's to good to go...
Hello. I will make a analysis about some information of my company. I thought making a ca to representate the association between two variables. I have 3 variables: Category, Tag, Valoration. My idea is to make 2 analysis, one to view the association between Category - Valorarion and a second analysis between Tag - Valoration. But I th...
I'm trying to figure out how many possible ways there are to combine various elements form this string. "{Hello|Hi|Hey} {world|earth}{!|.|?}" Where one item (separated by a pipe/|) is selected at random from each group ({}) and combined into a single string. So the above "template" could produce: Hello world. Hi earth? Hey world. Hi...
So, I know that is possible to retrieve some info, like Device name, unique ID, etc. all of them provided by UIDevice Class. I would like to know if there is a way to get information related with wireless usage (Download and upload), amount of SMS sent, minutes of talking, and any other statistics. Does anyone has any idea on how to ge...
In R, how can I import the contents of a multiline text file (containing SQL) to a single string? The sql.txt file looks like this: SELECT TOP 100 setpoint, tph FROM rates I need to import that text file into an R string such that it looks like this: > sqlString [1] "SELECT TOP 100 setpoint, tph FROM rates" That's so that I ...
Hi all. I'm going to write a little library and after the UI for agregating and visualizing statistics from the specified subversion repository. My question is: What do you need like a developers/leads/managers to see on the statistics ? Here I put down some initial ideas : 1. Commits by author(s) 2. Files that were changed by the...
Hello all! I am interested in getting statistics on the Ehcache I have running. I would like to see the number of hits/misses for a given key over a period of time. Perhaps in the form of a map. For example. For the passed hour (or however long it has been running) Key A had 30 hits and 2 misses Key B had 400 hits and 100 misses...
How to obtain server side stats using VSTS2008-Test edition? ...
I have a problem with Minitab (a statistics program). When I enter my general model and want to see the results, the program warns me: too few arguments or space missing. Everything seems true, and I can't determine where the problem is. Could anyone help me on this subject? ...
I am gathering data from a website. I estimate to get 10.000 datapoints (time - value) multipled by seven - over time. That is way to much. Both for storing and plotting it in a real time alike graph (through jQuery flot). I'm looking for a text dealing with this sort of problems. To be more precise: algorithms, statistical math for find...
Hi, I have a problem where I have a set of numbers eg. 5, 7, 7, 8, 8, 8, 7, 20, 23, 23, 24, 24, 24, 25 In the above set, there is two "clusters" of numbers, I want to write a program to find the centers of these clusters. Could you call them attractors as in Fractal theory? So the program would, I guess, find that the set can be divid...
I'm a programmer with a decent background in math and computer science. I've studied computability, graph theory, linear algebra, abstract algebra, algorithms, and a little probability and statistics (through a few CS classes) at an undergraduate level. I feel, however, that I don't know enough about statistics. Statistics are increasin...
I've been doing some research on statistical significance, and I've learned a lot but seem to have hit a wall when it comes to calculating P values. I feel like I'm about 95% of the way there; it's just that everything I read on calculating P values references a table rather than offering a programmatic solution. It seems that Excel's ...
Assume a group of data points, such as one plotted here (this graph isn't specific to my problem, but just used as a suitable example): Inspecting the scatter graph visually, it's fairly obvious the data points form two 'groups', with some random points that do not obviously belong to either. I'm looking for an algorithm, that would ...