Data source
Paste two columns
Paste X,Y (comma/semicolon/tab)
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CSV X column (optional)
CSV Y column (optional)
Confidence Level
0.95
show_residuals
X values to predict (comma separated)
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Title
Value
Title
Value
Title
Value
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If R² is high but residuals show a curve, the relationship is likely non‑linear. Prediction intervals widen as you move away from the mean X. P‑values tell you about slope ≠ 0, not about practical importance.