pvalue for the Utsu's test
Description
This function calculates the pvalue for the Utsu's test from 2 values of b and 2 sample sizes.
Usage
1  utcomp(b1, n1, b2, n2)

Arguments
b1 
bvalue 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 
bvalue 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 pvalue of the Utsu's test for the comparison of 2 bvalues.
Author(s)
Daniel Amorese
References
Utsu, T. (1992) Introduction to seismicity, Surijishingaku (Mathematical Seismology), Inst. Statis. Math, 34, (VII), 139157, (in Japanese).
Utsu, T. (1999) Representation and analysis of the earthquake size distribution: a historical review and some new approaches, Pure appl. Geophys., 155, 509535
See Also
BBootComp
Examples
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)
