**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-2.68 - 19 Sep 2019 15:23:50 GMT**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-2.68 - 19 Sep 2019 15:23:50 GMT**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-2.68 - 19 Sep 2019 15:23:50 GMT**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-2.68 - 19 Sep 2019 15:23:50 GMT**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-2.68 - 19 Sep 2019 15:23:50 GMT**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-2.68 - 19 Sep 2019 15:23:50 GMT**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"). Currently we compute mean and sample standard deviation. (Note w...

JOHNH/Fsdb-2.68 - 19 Sep 2019 15:23:50 GMT**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-2.68 - 19 Sep 2019 15:23:50 GMT