Linear Regression and ANCOVAHello!
I am working on running an analysis comparing # of mitochondria vs axon area in two different regions of a nerve (proximal & distal).
I tried to run a regression first, but since some data points are missing from my two groups, JMP says I cannot run a regression with missing data points.
unstacked but won't run regression b/c missing data points
I then stacked the data and it seemed to work so I can get 2 linear regressions on one graph but now I cannot run an ANCOVA because the data is stacked and is only recognized as one group. Can you advise me on how to run an ANCOVA on this data?
AnalyticsData TableOtherRe: Linear Regression and ANCOVAFor your situation, you should use data in the stacked format. In other words, a column for your axon area, a column for your proximal/distal, a column for your # of mitochondria.
But looking at the data that I can see, your mitochondria count is always 1 if it is proximal (which is a problem). Further, from the split data format, I see that you only have a mitochondria count for either proximal OR distal, but never both. You must have data for both in order to see the effect of proximal/distal. That is why your regression is not working.
Remember that a missing value (represented by the dot) is NOT the same as a zero. Once you have your data filled in properly, you should be able to conduct your analysis.
Re: Linear Regression and ANCOVAThank you for your response. Sorry, the screenshot does not show it but the Proximal does have other values other than 1. But the issue is that I need to run an ANCOVA on this data to report the p-values for the main effect of locus (proximal/distal) and interaction of locus x axon area (regressor). The axon area is never the same proximally vs distally. That is why its either a data point for proximal OR distal, never both. There is no way to take this into consideration for ANCOVA & regression?
