Sentences with phrase «cyclical changes in the frequency»
This explains observations made, for instance, in the USA: according to the FBI's Uniform Crime Reporting Program, cyclical changes in the frequency of criminal offences can be found in several American states.
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Although it is clear that further attention is required in defining and characterizing the aspects of this variation (e.g. frequency and amplitude [44,65]-RRB- that lead to differences in species responses, a more immediate empirical challenge is to characterize and separate the effects of periodic, stochastic and / or cyclical natural variations [61] from directional change imposed by long - term climatic forcing.