Data
.

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	that the data source of the BCA is stated;
	for discrepancies introduced by using multiple data sources;
	that socio-economic factors, climate anomalies and associated biological events that may affect the data were considered;
	whether the data are based on one year, and thus subject to particular events in that year, or on several years observations; and
	that statistical methodology was acceptable, perhaps with the assistance of a statistician or econometrician.

David Adamson