Re: AI-GEOSTATS: Standard deviation, Variance

2002-12-05 Thread Isobel Clark
The reason is simple and comprehensive Assume a population with ANY distribution of elements. Then randomly select a number of sample elements from the population to characterize the underlying population. That distribution of sample elements ALWAYS tends toward a normal [Gaussian]

Re: AI-GEOSTATS: Standard deviation, Variance

2002-12-05 Thread Digby Millikan
Apologise, The original email, The reason is simple and comprehensive Assume a population with ANY distribution of elements. Then randomly select a number of sample elements from the population to characterize the underlying population. That distribution of sample elements

Re: AI-GEOSTATS: Standard deviation, Variance

2002-12-05 Thread Ruben Roa
Isobel did not write the careless paragraph about the central limit theorem (CLT) Don replied to, as pointed out by Digby. I wish to add something to what Don said about the conditions under which the CLT applies, and that people usually miss in considering the universality of the CLT. See below.