最近12天的感染人数是12,15,19,25,30,36,41,50,64,87,95,108，回归方程284.2/(1 + exp(3.414 - 0.2467*X))，拟合优度0.9911。流行病学意义上还处于前期的指数增长阶段，估计本月25日之后疫情会趋于稳定，最终感染人数在284左右。当然现在的样本点还太少，统计意义不大，只是粗略估计一下。
General model:
f(x) = K/(1+exp(a+b*x))
Coefficients (with 95% confidence bounds):
K = 284.2 (6.693, 561.7)
a = 3.414 (2.668, 4.161)
b = -0.2467 (-0.3182, -0.1751)
Goodness of fit:
SSE: 105
R-square: 0.9911
Adjusted R-square: 0.9892
RMSE: 3.416
General model:
f(x) = K/(1+exp(a+b*x))
Coefficients (with 95% confidence bounds):
K = 284.2 (6.693, 561.7)
a = 3.414 (2.668, 4.161)
b = -0.2467 (-0.3182, -0.1751)
Goodness of fit:
SSE: 105
R-square: 0.9911
Adjusted R-square: 0.9892
RMSE: 3.416
