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# Read more on RANSAC models

Ransac models used in the MTrack include the line and polynomial models to perform the determination of inliers. SInce the underlying process of Microtubule dynamics is a random walk process, in order to determine the inliers it is essential to choose a polynomial to determine the inliers from the length versus time plots. The user has the option of choosing either a second order or a third order polynomial regularized with a linear function.

The regularization parameter determines how much linearity is present in the polynomial function used for the fitting.

- Polynomial model y = ax^3 + bx^2 + cx + d, would be the form of polynomial used to find the inliers with the coefficients determined via regression. Once the inliers have been found a line model is fit onto the inliers via regression.

- Line model y = cx + d, is the form of line model used to fit on the inliers to determine the growth and shrinkage rates.