Implement a residuals histogram for regression solutions

[sforsten]

A new view which shows the residual frequency in a histogram for the best solution shall be implemented to tell if a model is appropriate, as described ​http://itl.nist.gov/div898/handbook/pri/section2/pri24.htm.
Residuals are estimates of experimental error obtained by subtracting the observed responses from the predicted responses.

[sforsten]

r7186:

• added first version of the RegressionSolutionResidualHistogram

the residuals are already displayed, but with absolute frequency and only for all samples (not for training and test partition) furthermore the number of columns is fixed and the GUI has to be adjusted

[sforsten]

r7255: merged r7209 from trunk

• adjusted GUI
• added toggle for the different series
• X Axis labels are rounded to useful values
• added tooltip

The RegressionSolutionResidualHistogram can now be used in the branch ​http://dev.heuristiclab.com/svn/hl/core/branches/RegressionBenchmarks/.

[mkommend]

Reviewing comments:

• The All Samples series should be hidden by default.
• The resx file must be removed.
• Adapt license header to the new year (2012).
• Remove unused using.
• Improve source code formatting
  • Do not use /* */ comments except in the license header
  • Correct comments
  • this qualifiers can be omitted
  • Reduce usage of empty lines
  • Reorganize regions (e.g. events) and ordering of methods

After this changes have been applied, the ResidualHistogram can be merged into the trunk solution.

[sforsten]

r7485:

• changes according to mkommend's reviewing comments have been made

[mkommend]

r7500: Merged ResidualsHistogram in the trunk.

[sforsten]

Residuals should center around zero at the X-Axis.

[sforsten]

r7503:

• residual bars center around zero at the X-Axis
• some small changes in the appearance

[mkommend]

Review Comments:

• Remove ALL_SERIES constant and use chart.Series instead
• Order methods more logically in the source, so that the control flow is more obvious
• CalculateResiduals should just return the residuals instead of a dictionary
• Methods should not use a larger number of parameters and in addition access class members.
• Reevaluate usage of DataTableView instead of implementing a new histogram. q

[mkommend]

r8098: Minor modifications in residual histogram view.

[sforsten]

r8104:

• Removed ALL_SERIES constant
• Reordered methods
• CalculateResiduals returns now all residuals instead of a dictionary
• reduced number of parameters for methods were possible

[sforsten]

It seems to be difficult to implement the residual histogram with the DataTableView without adding a few new properties to DataRowVisualProperties and/or DataTableVisualProperties. I would suggest to leave it the way it is, at least for now.

[mkommend]

Please, rewrite the ResidualsHistogram to make the complicated data structure relativeFrequencies obsolete.

[sforsten]

r8173: The data structure relativeFrequencies is now obsolete and some other changes should make it more readable.

[mkommend]

r8176: Small change in ResidualHistogram.