function mgf( t ) {
		var st = s * t;
		if ( abs( st ) > 1.0 ) {
			return NaN;
		}
		return exp( mu * t ) / sinc( st );
	}
Evaluates the moment-generating function (MGF) for a logistic distribution.

@private
@param {number} t - input value
@returns {number} evaluated MGF

@example
var y = mgf( 0.5 );
// returns <number>