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<div class="block">Class for building and using a multinomial logistic regression model with a ridge estimator.<br/>
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 There are some modifications, however, compared to the paper of leCessie and van Houwelingen(1992): <br/>
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 If there are k classes for n instances with m attributes, the parameter matrix B to be calculated will be an m*(k-1) matrix.<br/>
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 The probability for class j with the exception of the last class is<br/>
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 Pj(Xi) = exp(XiBj)/((sum[j=1..(k-1)]exp(Xi*Bj