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# Passing and Bablok regression 1.0

Date Added: July 30, 2013  |  Visits: 283
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Passing & Bablok described this procedure in the 1983.This procedure is ideal if you want to compare 2 different methods (instrument) which measure the same chemical analyte in the same sample.Classical linear regression method assume that variables X and Y are normal distributed and with a measurement error costant over the range of concentrations.However, in method comparison studies we generally find that the distribution of measurements is not normal and that variance of errors is not costant.Passing & Bablok regression does not require specific assumptions regarding the distributions of the expected values or the error terms.Description of the Function PassingBablok (x,y):INPUT: x and y are arrays in column of values obtained measuring the same sample with 2 different analytical methods. It means that if you have i.e. i = 1....N samples, x (i) is the value obtained measuring the sample (i) with the method A and y (i) is the value obtained measuring the same sample (i) with the method B.OUTPUT: 1) Slope of the regression line 2) 95% CI of the slope (slope_UB and slope_LB) 3) intercept of the regression line 4) 95% CI of the intercept (Intercept_UB and Intercept_LB) This function also perform a statistical test of linearity and return the p value, using the cumsum adapted method (Kolgomogorv-Smirnov adapted test) described by Passing and Bablok.Three Graphs are plotted: a. Regression Graph, scatter plot with regression line b. Ranked residual Graph c. cumsum statisticAn example file are supply.

 Requirements: No special requirements Platforms: Matlab Keyword: Analytical,  Arrays,  Boutput,  Column,  Function,  Intercept,  Means,  Measuring,  Obtained,  Passingbablok,  Sample,  Samples,  Slope,  Xyinput Users rating: 0/10

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