Hello everyone
I wonder if anyone can advise how I can set a minimum value for an interpolated surface created by kriging and cokriging? (I want to set a minimum predicted value of zero). I am using the Geostatistical Analyst Wizard to create my model specifications - but may be able to get the modification scripted if necessary.
Many thanks, Beth
In most cases there should not be a problem. You can, however, see how well or how badly the data are being transformed. On the NormalSoreTransformation page in the Wizard change to a Cumulative graph and you’ll see if there is a large deviation or not.
The Wizard automatically does the back-transform so you don’t have to do that yourself.
-Steve
Thank you very much Steve. Sorry, one more question - if you have time? I am using the predicted surfaces as a visual mapping tool to discuss with farmers possible management changes to their farms (I am modelling soil carbon). I assume using this log transformation will give skewed visuals - ie some parts of the range will be more emphasized (visually) than others? (I do understand that I can calculate the true values by back-transforming the predicted ones if I am just looking at the numbers).
Many thanks for this Steve. I am working on 10.2.2 - in the wizard I see that I can choose log but can't see 'logempirical' please can you advise where this option is? Beth
Beth
In 10.1 we introduced some new transformations. If you pick LogEmpirical the predictions will be > zero.
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