with the square root of the overall variance that gives an estimate of the standard deviation for use within the conventional Bland-Altman limit of the agreement formula. yijlt represents the reading/measurement of the respiratory rate performed by the j device during the performance of the activity at the time of the theme i; μ is the total average; _i The random object effect is the random object effect. The fixed effect of the device that we need for identification reasons with 1 -2 -0; The random activity effect is called “Gamma” _l-sim N-Links (effect 0,Sigma, “Gamma” 2-Right) and the residual error is the residual error. We are expanding and modifying this basic model for each of the specific agreement methods listed below. In other settings, “device” may refer to “systems,” “spleens,” “methods,” “instruments,” or “observer.” Similarly, in other settings, the “subject” may refer to “subscriber,” “patient,” “website,” “experience,” mode. In the example of COPD, yijlt are simultaneous repeated measurements that are recorded by each device on each subject. For the limitations of the tuning method, the mixed linear model is rather suited to “mated differences,” which indicate the differences between devices measured at exactly the same time for each subject. Haber M, Barnhart HX. A general approach to assessing the agreement between two observers or measurement methods. Med Res Stat Methods. 2008;17:151-69. Barnhart HX, Haber MJ, Lin LI. An overview of the assessment of compliance with ongoing measures.
J Biopharm Stat. 2007;17 (4):529-69. Myles PS, Cui J. Using the Bland-Altman method to measure agreement by repeated measurements. Br J Anaesth. 2007;99(3):309–11. One of the most important methods for classifying different methods is to divide them into standardized match indices that are modulated so that they are within a given domain (for example. B the CCC is resized in values between 1 and 1 and the CIA between 0 and 1), and those that allow a direct comparison with the initial scale of the data and that require the specification of a clinically acceptable difference (z.B LoA, ET -TDI methods). These groups of methods are commonly referred to as methods of agreement at scale or scale , and these are sometimes referred to as “pure agreement cues” .
Indeed, the CCC can be described more precisely as an appreciation of discernment and not as an agreement, since it is intended to calculate the proportion of the variance of a system explained by the subject/activity effect and does not require an indication of CAD . This is not a “simple hint of agreement” . The CCC has the disadvantage of relying heavily on the variability between subjects (and, in our case, the variability between activities) and would therefore reach a high value for a population with significant heterogeneity between subjects or activities, although the agreement within the subjects might be low [2, 11, 12]. If the differences between the subject and the activity are very small, it is unlikely that the CCC will reach a high value, even if an agreement within a device is appropriate. With respect to the intra-class correlation coefficient (CCI), it is not related to the actual scale of measurement or the size of the error that might be clinically permissible, complicating interpretation .