Recent content by davemk

It was a study into causes of crime, using economic deprivation as an influence of crime (along with detection / conviction rates). It suggested that "neighbourhood effects" were a dynamic force affecting crime. As neighbourhood effects wasn't included in the analysis, I understood "dynamic...

Hi, hopefully this is a simple question and easily answered. I've been doing some reading on the subject of mathematical modelling and examples of modelling reports. In one report, the failings of the model are put down to "dynamic forces". I've taken this to mean that there are external...

Regarding the assumptions, aren't they that the errors should be normally distributed, have constant variance (homoscedasticity) and they should be independant? As far as I know (and stats isn't really my forte), the assumptions need to be met in order for a linear regression to be valid.

Hello again. If I was to get more data (say 70 observations) in order to test the model, is there a specific test that I could use? At the moment, I've performed a residual analysis and then I'm looking at performing a Wilcoxon's test or Spearman's test. Any thoughts on this process, or...

That's a great help, thank you very much. I've already plotted the residuals for obs vs expected and histograms for normailty so I'll have a look into the tests within the link you posted (I must admit, I've never heard of those tests so I'll have a read up on those). Thanks again. I'll...

Hi folks. Just looking for some input please. I have a dataset containing interval data (one dependent and 6 independent variables) and taken a random 90% sample (approx 300 observations). I've performed a linear stepwise regression on the 90%, in order to obtain a model to predict the...