Bland Altman Limits Of Agreement
A Bland-Altman plot (differential diagram) in analytical chemistry or biomedicine is a method of data representation used in the analysis of the agreement between two different trials. It is identical to a tube of average difference Tukey, the name under which it is known in other areas, but it was popularized in the medical statistics of J. Martin Bland and Douglas G. Altman.   with b – p n1.2 – t1 – α/2 (b1.2) and – BAU – z p N1.2 – t1 – α/2 ()) b1/2. In the particular case of α – 0.05, general expressions are reduced to confidence intervals for the two points of agreement of Bland and Altman : a significant correlation was found between systolic pressure measured by the family physician and ambulatory systolic pressure during the day (r-0.46; P<0.05). Physician measurements exceeded the measurements obtained through outpatient monitoring by an average of 18.9 mm Hg. The Bland-Altman method was used to present the difference in systolic blood pressure for each patient (GP minus outpatient daily monitoring) with the average of both measures (fig. 1⇓). Compliance limits are indicated by broken red lines, i.e. the two standard deviations of measurement differences on both sides of the average difference. On the other hand, in establishing confidence intervals between the boundaries of agreements or percentiles, Bland and Altman  argued that var[S] ≐ 2/(2) and Var [2) and Var [2) B] ≐ b-2/N, the B-1-for example _p. With the approach, they beat the simplified speed The delimitation shows the theoretical correlations between the different diet sizes in order to obtain precise confidence intervals.
In addition, seemingly accurate methods of reconciliation, which are also far removed from the main treasures, have unwanted confidence limits. It is found that the optimal sample size has a median or medium minimum and increases when the percentile approaches the extremes. Bland JM, Altman D.