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1 vote
0 answers
105 views

How can I incrementally calculate the 4 central moments in statistics (mean, standard deviation, skewness and curtosis) when a value is removed?

I'm incrementally calculating the 4 central moments. When a value x is added and n, M1, M2, M3 and M4 are some predefined values, I'm using the following algorithm: ...
6 votes
1 answer
6k views

Comparing two datasets with same variable

thanks in advance for anyone taking the time to read/answer this. I am comparing a ground-sourced dataset versus a satellite-sourced dataset for weather conditions, such as temperature. Both sets are ...
16 votes
1 answer
1k views

Why do Excel and WolframAlpha give different values for skewness

for the following 3 values 222,1122,45444 WolframAlpha gives 0.706 Excel, using =SKEW(222,1122,45444) gives 1.729 What explains the difference?