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hedekar t1_ivivxak wrote

What's the r value of those trend lines and why did you choose linear trendlines?

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reficius1 OP t1_ivlqpk7 wrote

Well suppose I picked a quadratic fit...what would the physical justification of it be? I just picked it as the simplest fit.

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hedekar t1_ivls9qj wrote

The data should determine which trendline makes sense to use. Usually this is done by calculating r-values of various trendline fits. By publishing a linear trendline on the chart you're claiming the data has a linear pattern. I'm asking for the evidence you used to make that claim.

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reficius1 OP t1_ivmhm3h wrote

Ok, but I wasn't really trying to be all that rigorous about it. This was really an exercise to help my gardening, and I thought the result might be of general interest.

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