Quadrat Analysis_RW_Thomas

It can be seen that the prob the ratio defined by 34

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: f a test statistic for assessing whether the observed frequency array was generated by a random process. The test is founded on the property of the Poisson distribution that its mean equals its variance. Consequently, if the observed frequency array is random the observed variance/mean ratio should tend to a value of 1, which gives the null hypothesis (35) When the variance/mean ratio is derived from a random quadrat sample the difference between the observed ratio and unity may be tested for significance 16 Applying this test to our example data produces the results listed in Table 4. Again we conclude that the observed frequency array was generated by a random process. If, in another application of the test, the null hypothesis were rejected H 1 would be accepted and we would conclude that the point pattern 17 is tending to be either, a clustered distribution, or, uniformly distributed in space. These secondary characteristics of the variance/mean ratio are discussed fully in the fol...
View Full Document

This note was uploaded on 02/15/2012 for the course GEO 6938 taught by Professor Staff during the Summer '08 term at University of Florida.

Ask a homework question - tutors are online