Maptitude estimates the attributes of area features by adding together the attribute values from features in the reference layer, based on the percentage that they overlap. However, no percentage is used when calculating the average.
Maptitude Mapping Software <http://www.caliper.com/> Group Moderator --- In [email protected], "wb0eig" <nealwess...@...> wrote: > > I'm new to this > > I have some contract dollar value data associated with Census Tracts. For example: 5 contracts having total value of $24,467 in a given census tract. The corresponding average is $4893. > Now.......when I do an Area of Influence using several sales centers and select this data as attributes of the appropriate layer, the resulting Contract data seems to be incorrect. By that I mean the total value of the Contracts and the Averages do not agree. When i manually divide the Total Contract Amount by the number of contracts, this manually computed result does not agree with the AoI table results. And by a significant amount - factor of 2 or more. > > Why is this? > > =neal= >
