Latest Contributions by LaurenSmith

Hi, I am working with GWR and can run it fine, however I am having problems with the results and what exactly to map. First of all just to check, the results titled C1, C2 and so on are the explanatory variable coefficients? Are these coefficients the coefficients of determination for each independent variable or something else? Also, I've been reading around the subject and finding out what is best to actually map to go into my reports, are these the explanatory variable coefficients best to map or I've read about dividing the explanatory variable coefficients by the standard errors to get the t-value to map. Sorry it this is very simple, I am new to ArcGIS and regression! Any advise would greatly be received. Thank you 🙂 ... View more

Hi, I am running the hot spot analysis to identify clusters of high and low areas of respiratory diseases. I have watched several esri videos about the topic and in an earlier video it talks about running moran's i autocorrelation to select a suitable distance band, in a more recent video I have watched it talks about calculate distance band and incremental spatial autocorrelation (ISA). I realise they both produce Moran's i z scores but I have run both and get different results so I am not sure which one is better to use. The results from ISA seem to be suggesting higher distance bands (peaking at higher distance values) which means by data is showing large hot spots (more like trends), where as the running Moran's i I see peaks in lower values which produces smaller hot spots. Would it be acceptable to use the calculate distance band and just use the maximum value in Moran's i as this produces a peak in the z score at a smaller distance. For example, the maximum distance is 2.09736dd, and the average is 0.368413dd. Results in ISA peak at 5.04dd and Moran's peaks at the 2.09dd value. Also, the conceptualisation of spatial relationships is to be the same as I am using in the hot spot analysis, yes? Thank you. ... View more

Hi, I'm not sure if anyone can help. I am using Modis MOD08_M3 data to look at aerosol data across Brazil. I've managed to load the file/subfile into Arc but I am unsure on the values of the data... I was under the impression the aerosol data had values between 1 and 0, however mine are much different to this. If anyone has experience with this data and know how to get the actual values and/or literature on how to, it would be great to hear from you. Thanks! ... View more

Hi, This is probably very simple to answer. I am running the Hot Spot Analysis for different years to examine any clusters of diseases. I have followed the on line video instruction and was wondering once I have distance band for one year do I use the same for all years or should I run the autocorrelation for each year to find the best distance band? I assume I do that but wasn't sure if it would mean the clusters are not comparable or something similar. Thanks ... View more

Hi, I am new(ish) to ArcGIS and haven't done Stat's in a few years so sorry if this seems very simple. I am attempting to explore relationships between respiratory diseases and 3/4 environmental variables over a large area. I have been advised to use GWR and I've read around the subject and it seems appropriate. However, it talks about spatial autocorrelation as well. I am wondering if I am meant to run Moran's i on the original data or on the residual results from GWR? Also, I have been advised I want the Morans i result to be around zero, is this correct? Thank you, Lauren ... View more