Hi Team, In SampleStat, I found the Welford method is used to calculate the variance in the following method.
public SampleStat add(long nSamples, double x) I don't understand the meaning of the parameter *x*. Does it mean the sum of the n samples. If so, I think the new mean calculated by a1 = a0 + (x - a0) / numSamples is not correct. It should be a1 = a0 + (x - nSamples * a0) / numSamples . However, there's no way to calculate the new variance. Could you help me to understand the equations? Thanks very much in advance. Best regards, Yanghong Zhong yangzh...@ebay.com
