# utcomp: p-value for the Utsu's test In GRTo: Tools for the Analysis of Gutenberg-Richter Distributions of Earthquake Magnitudes

## Description

This function calculates the p-value for the Utsu's test from 2 values of b and 2 sample sizes.

## Usage

 1 utcomp(b1, n1, b2, n2) 

## Arguments

 b1 b-value from the first sample n1 size of the first sample (number of data above or equal to the threshold magnitude in the first data set) b2 b-value from the second sample n2 size of the second sample (number of data above or equal to the threshold magnitude in the second data set)

## Details

The formula is given in Utsu's (1992, 1999).

## Value

utcomp returns the p-value of the Utsu's test for the comparison of 2 b-values.

Daniel Amorese

## References

Utsu, T. (1992) Introduction to seismicity, Surijishingaku (Mathematical Seismology), Inst. Statis. Math, 34, (VII), 139-157, (in Japanese).

Utsu, T. (1999) Representation and analysis of the earthquake size distribution: a historical review and some new approaches, Pure appl. Geophys., 155, 509-535

BBootComp
 1 2 # Utsu's \emph{p}-value for the comparison of 2 \emph{b}-values in the Santa Paula area. utcomp(0.97,366,0.77,1161)