I am struggling with how to approach my dataset for a meaningful analysis and need help.

I am looking at wound healing of sharks over time and have hit a wall with analysis. My data consist of injury cases which are tracked over time. Injury healing is measured as percentage wound area/perimeter change since initial sighting. Each case varies in the number of days since initial sighting and the total number of sightings with some only seen twice and some seen 5 times.

I want to look at changes over time and be able to statistically say that over time the wounds are decreasing in size. How can I achieve this? Should I use repeated measures?

Here is an example of data:

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Please tell me if this does not make sense or if more information is required to clarify my question.

  • $\begingroup$ One thing to do is visually inspect scatterplots of days vs. area and days vs. perimeter to see if any obvious patterns are present. You might put all data on the plots, colored by different wound type (boat, etc.). $\endgroup$ – James Phillips Jan 10 at 17:40

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