Method comparison blandaltman plot deming regression. What is a blandaltman plot, and can one be produced in spss. Correlation between the itd and icg techniques was determined using linear regression. This macro produces a blandaltman plot of paired data. Bland altman analysis the bland altman analysis is not a statistical test measured with a pvalue. Although i watched all the videos about bland altman plot in spss, i could not find any information regarding how to. Plotted points beyond the loa are identified in red. This video describes how to contsruct and interpret a plot that can assess the level of agreement between two mesurement techniques using a numneric outcome. The differences and averages of the data pairs are graphed with the center line and the limits of agreement loa. Blandaltman plot this macro produces a blandaltman plot of paired data. Suppose there are two techniques for measuring some continuouslyscaled variable, each having some error, and we want a graphical means to assess whether or not they are comparable. Instead, it is a process used to assess agreement between two methods of measurement.
Method comparison blandaltman plot deming regression ncss. Ncss includes easytouse tools for method comparison, including bland altman plot and analysis, deming regression, and passingbablok regression. Blandaltman method comparison using microsoft excel video. Plots a blandaltman and correlation plot for two data sets, including data. It plots the difference between the two measurements on the y axis, and the. Put your data into excel and use the formulae functions to calculate the. To see how these tools can benefit you, we recommend you download and install the free trial of ncss. Blandaltman and correlation plot file exchange matlab central. It plots the difference between the two measurements on the y axis, and the average of the two measurements on the x axis. Blandaltman analysis as an alternative approach for. You can control what is and what is not plotted through flag.
It can import excel, spss, dbase, lotus files, and files in. A bland altman plot compares two measures by plotting the score differences against the score averages. It has versions for mac and windows, and it is currently at version 7. Bland and altman 1986, 2003 an important requirement of the bland altman method for measuring agreement is that the two methods for measuring the same characteristic use the same scale of measurement. Explicit support including demo for correlation analysis only with correlationplot. This video demonstrates how to construct a bland altman plot in spss. For more information and to download the tutorial examples, visit. Medcalc is a standalone computer program for statistics in the biomedical sciences with an integrated spreadsheet for easy data input. You can download a free demo copy of medcalc software.