Hi all
I activated an histogram plugin for raster data (see Toolbar>Raster>Create
Histogram). The idea is to have a raster plugin with more option than
Sextante one. One that could have helped user to calculate also statistic
indices (mean, median but also 25/75 percentiles, Kustosis, Skewness) and
frequancies of classes.
To get statistic indices I used as base a class form Sextante algorithms
which I modified and extended to other useful indices.
I used the OJ embedded libraries (jmathplot-20070905.jar) to get the
histogram in order not to extend depencies to othet plot libraries (as
Sextante and OpenKLEM have). Jmathplot gets back plotted data as a matrix.
In the case of a HistogramPlot.class, these data are: 1) absolute
frequency and 2) the median value of the range for each intervals.
To get also cumulative frequancy, realtive frequancy and min/max values (of
the range for each intervals) I created some method and placed into
Plot2DPanelOJ class
More job has to do (fix some parts of the statistic class, better
definition of frequency methods, etc)
Any comment is welcome
Peppe
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