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This is an extension to the question asked in the forums a few years ago:

Excel produces scatter diagrams for sets of pair values. It also gives the option of producing a best fit trendline and formula for the trendline. It also produces bubble diagrams which take into consideration a weight provided with each value. However, the weight has no influence on the trendline or formula. Here is an example set of values, with their mappings and weights.

Value Map     Weight
0       1      10
1       2      10
2       5      10
3       5      20
4       6      20
5       1      1

I have used the formula that brettDJ offered: 

=INDEX(LINEST(B2:B7*C2:C7^0.5,IF({1,0},1,A2:A7)*C2:C7^0.5,TRUE,TRUE),3,1)

However, I could not understand why we used the ^0.5 here to sqrt the weights. The original question is here

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  • Could you please provide a link to the previous question. – gtwebb Jul 19 '16 at 19:50
  • *I could not understand why we used the ^0.5 here to sqrt the weights* - Is this really a programming / formula question? Or rather a math question? – Scott Holtzman Jul 19 '16 at 20:25
  • I'm voting to close this question as off-topic because it seems to be a math question rather than a programming question. – Scott Holtzman Jul 19 '16 at 20:25
  • As I understand it, ^x represents the order of the equation. For example ^3 will mean that the order of the trendline = 3. SO how does 0.5 fit into it. – Mehul Garg Jul 19 '16 at 20:58

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