Figure4-poster

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John Dege
January 18, 2016 6:36 am

why always straight line trend lines??
why not some other trend line- Excel has lots

KELVIN DUNCAN
Reply to  John Dege
March 31, 2019 3:36 pm

Purists desist in fitting smooth curves for two reasons: to show the original data points clearly and obviously rather than giving the impression that there are a lot of data points; and because smoothing functions fitted to a limited data set can play up!