private void bDtodouble(){
        this.responses0 = new double[this.nGroups][];
        for(int i=0; i<this.nGroups; i++){
            this.responses0[i] = new double[this.nResponsesPerGroup[i]];
            for(int j=0; j<this.nResponsesPerGroup[i]; j++){
                this.responses0[i][j] =  this.responsesBD[i][j].doubleValue();
           }
        }
    }