Dear everyone,
A scatter plot was created using the chart
builder; then, a cubic curve was
drawn (superimposed) in the scatterplot using the chart editor. The R square of that cubic
curve was 0.855. Then, using the same dataset, a cubic model was run
using the curve estimation under the regression menu and yielded an R squared of 0.845. I wonder why the
two R squares (0.855 vs 0.845) differ? Any comments are welcome!
Thank you.J. Talili
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