1. age = t ± x | y | z

   t: |
   x: |
   y: |
   z: |

2. (207Pb/204Pb)0 (40Ar/36Ar)0 (234U/238U)0 (230Th/232Th)0x intercept = u ± x | y | z

   u: |
   x: |
   y: |
   z: |

3. MSWD = x, p(χ2) = y

   x: |
   y: |

4. y-dispersion = ω + u /- l

   ω: |  |
   u: |
   l: |

Nicolaysen, L. Graphic interpretation of discordant age measurements on metamorphic rocks, 1961. Annals of the New York Academy of Sciences, 91(1):198–206.

Ludwig, K.R. and Titterington, D.M., 1994. Calculation of 230Th/U isochrons, ages, and errors. Geochimica et Cosmochimica Acta, 58(22), pp.5031-5042.

York, D., Evensen, N.M., Martinez, M.L. and De Basabe Delgado, J., 2004. Unified equations for the slope, intercept, and standard errors of the best straight line. American Journal of Physics, 72(3), pp.367-375.