3.2. Bland Altman analysis of different methods
Different statistical methods are available to test the inter changeability of methods and if a new method produces similar results then the established standard method. In this case the Bland–Altman plot analysis confirms that no systematic error exists between the new method and the two established reference methods (Fig. 3, Fig. 4). But, the data distributed in different pattern because data shows from AOAC method nearest and HPLC method lower in comparison to iCheck method. When data analysed to compare AOAC and HPLC method (Fig. 5) similar pattern of distribution observed as comparison between iCheck and HPLC method (Fig. 4), because data from AOAC method is nearest to the iCheck method.