When I compute mean using zonal average in ArcGIS, is it taking into account the 'COUNT' in the value attribute table? e.g. if I have a raster with

1           10
2           20
3           30

If I run zonal statistics on above raster, will it ignore the COUNT column? Any references in your answer will be helpful

  • 1
    I don't know if looks at the count field per se but, use some common scene here. How else would the mean be derived? The cells intersecting a given "zone" are summed and then divided by the number of observations thus, giving the mean. In your example, if the values represented a given zone, the mean would be 2.33. Out of curiosity, how would one "weight" the mean, using count, given that the count is the same as n and therefore is used to derive the mean? – Jeffrey Evans Oct 19 '15 at 15:34
  • Do you actually have a count value for each cell that you wan to weight by or is that the count of each value? – Evil Genius Oct 19 '15 at 17:56

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