```
Revision history for Statistics-Sequences-Vnomes-0.20
0.20 1 Mar 2016
- corrected calculation of circularized psi-sq: was implemented from Good (1953, Eq. 2), the original paper on this test. However, it was seen (after multiple use) to sometimes yield negative values - because it does not square the observed-expected count difference in the sum-of-squares. This was (silently) corrected in Good & Gover (1957), which is now implemented.
- psisq() called in list context now also returns df and p_value
- removed z_value method - only appropriate if df = 1, and requires test of validity
- removed from code undocumented and inappropriate option to set "tails" for p_value (error of code-recycling from other Sequence modules)
- removed "nstates" arg from nnomes() method; just supply aref of "states" if necessary, as for other methods
- croak re undefined or zero length argument rewritten, made method-specific
- removed croak from observed() if a defined length of v is not valid so that frequencies can still be obtained
- removed doc of excessive aliases for observed() and other methods - support remains but will be removed in next version
- removed NIST examples from testing as these appear to be basd on circularizing the sequence but then calculating the expectation value in the sum-of-squares in a way that is appropriate for uncircularized sequences.
- added DIAGNOSTICS section to POD
0.11 18 July 2013
- Corrected calculation of psisq for uncircularized sequences, with test of it in ref.t from Tart
- Added variance(), stdev(), nnomes() and prob_r() methods.
- More verbosity in dump() with format => 'table'
- Clean up redundant code for expected() and psisq()
- Ensure tails => 1 by default whenever getting p_value(). Could make more intelligent later on.
- Misc. POD revisions, including adding formulae for psisq
0.10 27 June 2013
- Integrated with Statistics::Data via Statistics::Sequences
- Methods for observed(), expected(), etc., standrdized so work as in other Statistics::Sequences sub-modules
- No croak if only 1 event in sequence
- Not compatible with previous versions 0.01-0.05
0.01 Tue Nov 6 1:45:43 2012
First version, released on an unsuspecting world.
```