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- Comparing regression lines of different data

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Oct 25, 2010 11:16 PM
(875 views)

One set is the number of Sea urchin spine breaks vs the treatment

The other set is Level logger reading vs Site

If you need context: I have field samples of urchins, I quantified spine breaks and noted their collection location as treatment. Alongside this study, we placed sensors that log waves, and i have them organized by site. Id like to see if there is any correlation between these two regressions.

Thanks in advance.

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Oct 26, 2010 12:33 AM
(757 views)

So now my question is, can I compare slopes of these comparisons (S v B and S v L) if they don't have the same number of data points?

For example, for site 1, there may be 75 'B' points, but 89 L points.

Also, I've heard something about using ANCOVA for this, but I also heard something about dummy columns..I'm not sure how to run this (I have 10 sites)

Any help would be greatly appreciated.

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Oct 26, 2010 1:24 AM
(757 views)

If you have different number of rows for B and L, stored in separate columns, and include them in the same model I think JMP wold not include rows where on or more numbers are missing in the analysis.

Can you provide more details about what you want to do?