- 
    age  = x ± y 
    
      (| z)
    
    
    
    
    
  
- 
    
      (207Pb/204Pb)c
    
      (40Ar/36Ar)0
    
      (Pb/Pb)c
    
    
      (234U/238U)i
    
    
      (230Th/238U)i
    
    
      (234U/238U)a
    
    
      (230Th/232Th)d
    
    
      (230Th/232Th)0
    
    
      (230Th/238U)a
    
    
      (234U/238U)i
    
    intercept
    = x ± y 
    
      
	(| z)
      
    
    
    
    
    
  
- 
    MSWD = x, p(χ2) = y 
    
    
    
    
  
- 
    dispersion = x ± y
    
    
    
    
  
  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.
  
  Ludwig, K.R., 1998. On the treatment of concordant uranium-lead ages.
  
Geochimica et Cosmochimica Acta, 62, 665-676.
  
  Vermeesch, P. 2020. Unifying the U-Pb and Th-Pb methods: joint
  isochron regression and common Pb correction, 
Geochronology,
  2(1), 119-131,
  
  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.