# plotting_positions¶

class reliability.Probability_plotting.plotting_positions

Calculates the plotting positions for plotting on probability paper This function is primarily used by the probability plotting functions. The order of the input data is preserved (not sorted).

Inputs: failures - the array or list of failure times right_censored - the array or list of right censored failure times a - the heuristic constant for plotting positions of the form (k-a)/(n+1-2a). Default is a=0.3 which is the median rank method (same as the default in Minitab and Reliasoft).

Must be in the range 0 to 1. For more heuristics, see: https://en.wikipedia.org/wiki/Q%E2%80%93Q_plot#Heuristics

Outputs: x,y - the x and y plotting positions as lists