\sum_{i=t}^{t+K-1} {\rm data}[i] = \sum_{i=t-1}^{(t-1)+K-1} {\rm data}[i] - {\rm data}[t-1] + {\rm data[t+K-1]}
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  1. http://formula.s21g.com/?%5Csum_%7Bi%3Dt%7D%5E%7Bt+K-1%7D...
  2. http://techtipshoge.blogspot.com/2012/03/blog-post.html?v...
  3. http://techtipshoge.blogspot.com/2012/03/?m=1
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  5. https://formula.s21g.com/