Din One of the things you need to consider is whether you want to test the mean of the whole population or of a specific area in space.
The 'population' in geostatistical terms would be not just the actual 'relaisation' we have (that is, if we sampled every location) but all the possible realisations we might have had. I think this is what you are effectively proposing. Alternative would be to do an estimate of the average over the area of interest and use the kriging estimator and variance/standard error in your t-test. This, of course, depends on your population being amenable to the Central Limit Theorem. Shouldn't be a problem unless you have highly skewed data. Isobel Clark http://geoecosse.bizland.com/news.htm __________________________________________________ Do You Yahoo!? Everything you'll ever need on one web page from News and Sport to Email and Music Charts http://uk.my.yahoo.com -- * To post a message to the list, send it to [EMAIL PROTECTED] * As a general service to the users, please remember to post a summary of any useful responses to your questions. * To unsubscribe, send an email to [EMAIL PROTECTED] with no subject and "unsubscribe ai-geostats" followed by "end" on the next line in the message body. DO NOT SEND Subscribe/Unsubscribe requests to the list * Support to the list is provided at http://www.ai-geostats.org
