. Author manuscript; available in PMC: 2006 Sep 22.

Published in final edited form as: J Geogr Syst. 2006 Sep;8(3):227–252. doi: 10.1007/s10109-006-0027-8

Table 3.

Iceland measles waves, 1915–1974: comparisons between the velocity of leading edges and following edges

Velocity parameters	Measure	Expected relationship	Leading edge (LE)	Following edge (FE)	Velocity difference confirmed?	Difference^a
Location	Mean (months)	LE < FE	8.99	11.82	Yes	2.83^***
	Mean (%)	LE < FE	44.82	59.19	Yes	14.37^***
Dispersion	Standard deviation (months)	LE < FE	3.83	3.71	No	0.13
	Range (months)	LE < FE	14.57	16.64	Yes	2.07^*
	IQR (months)	LE < FE	4.07	6.21	Yes	2.14^**
Skewness		LE > FE	0.599	0.401	Yes	0.198
Kurtosis		LE > FE	0.460	0.456	Yes	0.004

Single-tailed paired t-tests:

probably significant (p=0.05),

^**

significant (p=0.01),

^***

highly significant (p=0.001)