We thus calculate the probability of a Ming tombstone conditioned by some of the tomb attributes discussed above for Taiwan, Penghu and Jinmen, first in isolation and then combining them through the formula (2). For all estimates we use additive smoothing, which is also called Laplace (拉普拉斯) smoothing. Increasing all frequency counts by a small value, we use α =0.001, the estimates of rare events increase by a small value while the estimates of the frequent events are decrease by a small value, thus correcting the oversampling of frequent and the undersampling of infrequent events \cite{wiki:additivesmoothing}. The results of these probability estimates are summarized in 表二