提供了一种lognormal分布定参的程序（程序中离散单位长度为1），R^2是统计量相关系数考虑了未知量的个数(2个)和拟合的精度。-Providing the program (in discrete units of length 1) a lognormal distribution of a given parameter, R ^ 2 is the correlation coefficient statistic considering the number of unknowns