### Search results for "module:Fsdb::Filter::dbmultistats"

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Fsdb::Filter::dbmultistats - run dbcolstats over each group of inputs identified by some key

The input table is grouped by KeyField, then we compute a separate set of column statistics on ValueField for each group with a unique key. Assumptions and requirements are the same as dbmapreduce (this program is just a wrapper around that program):...

JOHNH/Fsdb-3.0 - 04 Apr 2022 22:44:17 UTC###
Fsdb::Filter::dbroweval - evaluate code for each row of a fsdb file

Evaluate code for each row of the data. Typical actions are things like reformatting and other data transformations. Code can include embedded column names preceded by underscores; these result in the value of that column for the current row. The val...

JOHNH/Fsdb-3.0 - 04 Apr 2022 22:44:17 UTC###
Fsdb::Filter::dbcolstats - compute statistics on a fsdb column

Compute statistics over a COLUMN of data. Records containing non-numeric data are considered null do not contribute to the stats (with the "-a" option they are treated as zeros). Confidence intervals are a t-test (+/- (t_{a/2})*s/sqrt(n)) and assume ...

JOHNH/Fsdb-3.0 - 04 Apr 2022 22:44:17 UTC###
Fsdb::Filter::dbpipeline - allow db commands to be assembled as pipelines in Perl

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 ...

JOHNH/Fsdb-3.0 - 04 Apr 2022 22:44:17 UTC###
Fsdb::Filter::dbmapreduce - reduce all input rows with the same key

Group input data by KeyField, then apply a function (the "reducer") to each group. The reduce function can be an external program given by ReduceCommand and ReduceArguments, or an Perl subroutine given in CodeFile or FilterCode. If a "--" appears bef...

JOHNH/Fsdb-3.0 - 04 Apr 2022 22:44:17 UTC###
Fsdb::Filter::dbrvstatdiff - evaluate statistical differences between two random variables

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...

JOHNH/Fsdb-3.0 - 04 Apr 2022 22:44:17 UTC###
Fsdb::Filter::dbcolmovingstats - compute moving statistics over a window of a column of data

Compute moving statistics over a COLUMN of data. Records containing non-numeric data are considered null do not contribute to the stats (optionally they are treated as zeros with "-a"). Statitics are computed over a WINDOW of samples of data. [In pro...

JOHNH/Fsdb-3.0 - 04 Apr 2022 22:44:17 UTC###
Fsdb::Filter::dbfilestripcomments - remove comments from a fsdb file

Remove any comments in a file, including the header. This makes the file unreadable by other Fsdb utilities, but perhaps more readable by humans. With the -h option, leave the header....

JOHNH/Fsdb-3.0 - 04 Apr 2022 22:44:17 UTC