For example, I had two group of samples, I calculated the distance decay-rates of the two groups of samples respectively, then I got two values DDRa and DDRb. How can I test the difference between the two values?
Thank you for your reply!
Hi Sathyamurthy,
Thank you for your kind reply. What I want to calcuate is the difference between two regression lines, ie the distribution of the data. The method you provided may for detecting difference between two group samples (n>3).
Zhang, do you mean you are trying to test the difference between slopes for two independent groups?
Here's another document that may help.
http://core.ecu.edu/psyc/wuenschk/MV/multReg/Potthoff.pdf
Another way to compare two slopes from two different groups is to use the bootstrap. Bootstrap each group, generating the two slopes. Do this 1000 or 10,000 times saving the results. You will have a distribution of the slopes and how often they overlap. Probabilities can be calculated from the distribution. Wish you well.
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