function getCDF( name ) {
	var cdf = CDF[ name ];
	if ( cdf === void 0 ) {
		throw new Error( format( 'invalid argument. Unsupported/unrecognized distribution name. Value: `%s`.', name ) );
	}
	return cdf;
}
Returns the cumulative distribution function (CDF) corresponding to a provided distribution name.

@private
@param {string} name - distribution name
@throws {Error} unsupported/unrecognized distribution name
@returns {Function} cumulative distribution function (CDF)