[word=estimates] [□]
[word=estimates] [□=□]
[word=estimates] [□ & □]
The methods used to select the reference animals are critical to the accuracy of the estimates ( 5 ) . Significant variation of spatial statistics across a site , or non-random sampling can violate the basic assumptions of stationarity ( Journel and Huijbregts , 1978 ) and this can lead to strongly biased estimates ( Dagdelen and Turner , 1996 ) . The conservation estimates ( including sums to be set aside for ongoing maintenance ) range from a few thousand dollars into the six figure range , so the program appeals to philanthropic individuals as well as larger organizations . Population estimates ( denominators ) reflect exclusion of “ not applicable ” categories . A major product of this work is a set of deformation velocity estimates ( the rate at which the Earth 's crust moves ) for 287 sites in southern California . Further , countries such as Burundi , Rwanda and Democratic Republic of the Congo that previously only reported refu - gees are now also producing internally displaced estimates [ 7 ] .