coefficient of variation (CoV)

571 Views
Last Post 03 April 2019

Stephen Irinyemi posted this 12 February 2019

Please can I know how to calculate coefficient of variation (CoV) in R-CRISIS?

what is N and k represent.

Thanks

#Permalink
0
0
0

4 Comments

Order By: Standard | Newest | Votes

Content_Manager posted this 11 March 2019

Dear Stephen,

The coefficient of variation you are asking for is applicable for a Bayesian approach in which gamma distribution is assumed for beta and lambda a priori distribution (k is a parameter of gamma distribution). If you desire to use this methodology, you have to define this parameter based on your experience and knowledge of the problem. But, if you are planning to use the maximum likelihood approach, this just is a particular case of the more general Bayesian method in which the coefficient of variation of beta would be:

Where N is the number of records you used to calculate the seismicity parameters; this definition also applies for the Bayesian approach.

For more information about how to calculate beta and lambda parameters by means of maximum likelihood approach, you may look for Ordaz & Giraldo (2018) methodology.

Ordaz, M. G., & Giraldo, S. (2018). Joint Maximum Likelihood Estimators for Gutenberg-Richter Parameters λ0 and β Using Subcatalogs. Earthquake Spectra, 34(1), 301–312. https://doi.org/10.1193/092816EQS162M

Thank you for your preference and interest in R-CRISIS.

Best regards,