Error measures for DR chords: Difference between revisions

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 Setting the derivative to 0 gives us the closed-form solution
-<math>x = \frac{\sum_{i=1}^n D_i }{-n + \sum_{i=1}^n r_i},</math>
+<math>x = \frac{\sum_{i=1}^n D_i^2 }{\sum_{i=1}^n D_i(r_i-1)},</math>
 which can be plugged back into
-<math>\sqrt{\sum_{1=1}^n \Bigg( 1 + \frac{D_i}{x} - r_i \Bigg)^2 }</math>
+<math>\sqrt{\sum_{i=1}^n \Bigg( 1 + \frac{D_i}{x} - r_i \Bigg)^2 }</math>
 to obtain the least-squares linear error.
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 == External links ==
-* [http://inthar-raven.github.io/delta/ Inthar's DR chord explorer (includes least-squares error calculation in both domains and multiple error models)]
+* [http://turbofishcrow.github.io/delta/ Inthar's DR chord explorer (includes least-squares error calculation in both domains and multiple error models)]
 [[Category:Math]]