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*Dear all,*

given a dataset of (x,y) coordinates, how can someone determine the equation of a plot created with Origin or Excel that passes through all these points?

Depending on the dataset, it is safe to use a trendline ( i.e logarithmic, polynomial) in Excel. The problem is that the graph which will be generated, will provide an equation close to the one that is determined by the given dataset but not the "real" one.

It is a query that many people including me have and it would be thankful to read someone's recommendations.