I'm assuming that you are using something like Pull=Floorspace/Distance ^ 2.0
So you take the distances to each respondent to each centre and then run the "Pull" formula against each centre. That sum of "pull" is the total pull of all centres to the respondent. The "share" of pull of each centre is therefore the "pull" of that centre divided by the Sum of "Pull" *100. How you represent that graphically varies - for example.you could simply run a thematic map against the Share of Pull variable for each respondent, or you could try something trickier like running voronoi around each respondent and then aggregating the voronoi based on a "pull" range.. Nick Nick Much appreciate the reply. After you create the distance using Fill>Tag, how do you apply the mall sizes (thus gravity pull) and then how to use with Network Bands (based on travel time)? I am looking to get bands that show the pull to a particular mall, so so show competition between centres. Any luck on getting that to work? Thanks Matt Myers RMIT University Melbourne, VIC Australia [email protected] <mailto:matt.myers%40rmit.edu.au> --- In [email protected] <mailto:Maptitude%40yahoogroups.com> , "Nick Nicholas" <tthedemo@...> wrote: > > > > Yes, I've run quite a number of gravity models using Maptitude. You can > calculate linear distance by using the Fill>Tag command within a dataview. > So open up the consumer dataview file, add a new field called "Distance to > centre" and then use fill>tag to calculate the distance from the centre to > each customer. There's one annoying feature and that is that you will need > to create a separate layer for each retail outlet within the gravity model > analysis. There's probably some way around it, but I can't find it! > > > > Nick > > > > > > Description: Logo and address > > > > > > > > > > > > > > > > From: [email protected] <mailto:Maptitude%40yahoogroups.com> [mailto:[email protected] <mailto:Maptitude%40yahoogroups.com> ] On Behalf > Of tuituraga > Sent: Saturday, 25 August 2012 4:44 PM > To: [email protected] <mailto:Maptitude%40yahoogroups.com> > Subject: [Maptitude] Huff Gravity Model > > > > > > Anyone ever done a Huff Retail Gravity Model in Maptitude? Is there a way to > measure distance or travel time between points (such as retail location) and > consumer? > > Thanks >
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