其實這篇不是第一篇關於B-A圖跟LoA了，但是這次在寫討論的時候還是說不出個所以然來。
直到我看到了一句話，突然解開畫B-A圖、算LoA跟使用ICC計算再測信度的差異（當然，也有老師的指點，只是在討論的當下我好像還沒有馬上抓到重點。）
抱歉這麼晚釐清，但是釐清真的很爽。
結論：兩者的差異在於ICC是計算團體層級的再測信度，B-A圖跟LoA因為是個別分數的散佈圖，所以能反映出個體層級的再測信度，這才是這兩者分開討論最主要的差異。
Bland and Altman have expanded on this idea by graphing the difference of each point, the mean difference, and the limits of agreement on the vertical against the average of the two ratings on the horizontal.
The resulting Bland–Altman plot demonstrates not only the overall degree of agreement, but also whether the agreement is related to the underlying value of the item. For instance, two raters might agree closely in estimating the size of small items, but disagree about larger items.
