From the link that Dan shared:
The population field could be used to weight some features more heavily than others, depending on their meaning, or to allow one point to represent several observations. For example, one address might represent a condominium with six units, or some crimes might be weighted more heavily than others in determining overall crime levels. For line features, a divided highway probably has more impact than a narrow dirt road, and a high-tension line has more impact than a standard electric pole.
Also the help for the tool itself Kernel Density—Help | ArcGIS Desktop has a extended explanation of what you can specify (numeric field, shape if it contains Z values or None if each point should be counted as 1).
I am trying to do kernel density on a shape file . But when i try to use KDE, certain fields are not visible in the population field drop down.
Why is this so? I need the missing fields for my analysis
Wondering if you had something for me?
Yes .It is the centroid for the polygons.
I am sorry about the table of contents, i highlighted the wrong layer.
But yes, i was working KDE on centroid of polygons.
Thank you everyone