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Lognormal_probability_plot

class reliability.Probability_plotting.Lognormal_probability_plot

Lognormal probability plot

Generates a probability plot on Lognormal scaled probability paper so that the distribution appears linear. Inputs: failures - the array or list of failure times right_censored - the array or list of right censored failure times fit_gamma - True/False. Default is False. Specify this as True in order to fit the Lognormal_3P distribution and scale the x-axis to time - gamma. show_fitted_distribution - True/False. If True, the fitted distribution will be plotted on the probability plot. Defaults to True show_scatter_points - True/False. If True, the plot will include the scatter points from the failure times. Defaults to True. 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).

CI - the confidence interval for the bounds. Default is 0.95 for 95% CI. CI_type - time, reliability, None. Default is time. This is the type of CI bounds. i.e. bounds on time or bounds on reliability. Use None to turn off the confidence intervals. kwargs are accepted for the fitted line (eg. linestyle, label, color)

Outputs: The plot is the only output. Use plt.show() to show it.

Note that fit_gamma is not an option as the Fit_Lognormal_3P is not yet implemented.