Top "Statistics" questions

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Principal Components Analysis - how to get the contribution (%) of each parameter to a Prin.Comp.?

I want to know to what degree a measurement/parameter contributes to one of the calculated principal components. A real-world …

r statistics princomp
How do I get RSS from a linear model output

Below is a linear model output for a dataset consisting of a response variable and three explanatory variables. How do …

r statistics rss linear-regression
How to Clear down Query Execution Statistics in SQL Server 2005/2008

Based on getting Query Execution Statistics using this extremely useful piece of SQL obtained from this post Most Executed Stored …

sql sql-server performance statistics sql-execution-plan
Constructing a co-occurrence matrix in python pandas

I know how to do this in R. But, is there any function in pandas that transforms a dataframe to …

python pandas statistics
Calculating weighted mean and standard deviation

I have a time series x_0 ... x_t. I would like to compute the exponentially weighted variance of the data. …

r statistics mean weighted
PHP algorithm to generate all combinations of a specific size from a single set

I am trying to deduce an algorithm which generates all possible combinations of a specific size something like a function …

php algorithm statistics combinations
Test if a data distribution follows a Gaussian distribution in MATLAB

I have some data points and their mean point. I need to find whether those data points (with that mean) …

matlab statistics distribution gaussian
Is there a Python module to open SPSS files?

Is there a module for Python to open IBM SPSS (i.e. .sav) files? It would be great if there's …

python dataset statistics python-module spss
Select k random elements from a list whose elements have weights

Selecting without any weights (equal probabilities) is beautifully described here. I was wondering if there is a way to convert …

algorithm math random statistics probability
In a matplotlib plot, can I highlight specific x-value ranges?

I'm making a visualization of historical stock data for a project, and I'd like to highlight regions of drops. For …

python statistics matplotlib