Fsdb::Filter::dbcolscorrelate - find the coefficient of correlation over columns

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Compute the coefficient of correlation over two (or more) columns. The output is one line of correlations. With exactly two columns, a new column *correlation* is created. With more than two columns, correlations are computed for each pairwise combin...

Fsdb - a flat-text database for shell scripting

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Fsdb::Filter::dbpipeline - allow db commands to be assembled as pipelines in Perl

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This module makes it easy to create pipelines in Perl using separate processes. (In the past we used to use perl threads.) By default (as with all Fsdb modules), input is from STDIN and output to STDOUT. Two helper functions, fromfile and tofile can ...

Fsdb::Filter::dbrvstatdiff - evaluate statistical differences between two random variables

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Produce statistics on the difference of sets of random variables. If a hypothesized difference is given (with "-h"), to does a Student's t-test. Random variables are specified by: "m1c", "m2c" The column names of means of random variables. "sd1c", "s...

Fsdb::Filter::dbcolstatscores - compute z-scores or t-scores for each value in a population

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Compute statistics (z-score and optionally t-score) over a COLUMN of numbers. Creates new columns called "zscore", "tscore". T-scores are only computed if requested with the "-t" option, or if "--tmean" or "--tstddev" are explicitly specified (defaul...

Fsdb::Filter::dbcolsregression - compute linear regression between two columns

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Compute linear regression over "column1" and "column2". Outputs slope, intercept, and correlation coefficient....