Re: [ai-geostats] Pareto vs Lognormal distribution

2005-09-02 Thread Beatrice Mare-Jones
Hi Chris Thank you for your reply. And thank you for your paper reference - I'll take a look at your probability plots. Yes the apparent lognormality of oil and gas fields which moves more to a Pareto form with progressive and mature exploration is explained by undersampling at the low end

Re: [ai-geostats] Pareto vs Lognormal distribution

2005-09-02 Thread Beatrice Mare-Jones
Sciences Limited 69 Gracefield Road, Lower Hutt, WELLINGTON NEW ZEALAND 64 4 570 4821 [EMAIL PROTECTED] www.gns.cri.nz (Ted Harding) [EMAIL PROTECTED] 02/09/2005 20:56 Please respond to ted.harding To: Chris Hlavka [EMAIL PROTECTED] cc: ai-geostats@unil.ch, Beatrice Mare

[ai-geostats] Pareto vs Lognormal distribution

2005-08-31 Thread Beatrice Mare-Jones
Hello list I am a PhD student looking at developing a statistical model to predict the size-distribution of an area's oil and gas fields. It is clear that previous investigators prefer either a Pareto power law or a lognormal distribution to approximate field-size distributions. The data I

Re: [ai-geostats] Frightened of Spatial Autocorrelation

2004-09-02 Thread Beatrice Mare-Jones
Hello Kevin You may like to speak to David Hansen a GIS Specialist/ Soil Scientist at the USGS in Sacramento - [EMAIL PROTECTED] He has a good paper Describing GIS Applications: Spatial Statistics and Weights of Evidence Extension to ArcView in the Analysis of the distribution of