Does Surgical Implantation Affect Hummingbird Weight Loss?

AI Thread Summary
The discussion focuses on analyzing the impact of surgical implants on the weight loss of hummingbirds over a six-month period. The data shows a systematic decrease in mass at specific intervals, complicating the assessment of the implant's effect since surgeries were performed at different times. The author is considering using ANOVA with day number as a covariate but is uncertain about the appropriate statistical tests to apply. There is confusion regarding the relevance of the chi-square test for homogeneity in this context. Clarifying the statistical approach is essential for accurately interpreting the data and understanding the relationship between surgery and weight loss.
Seadragon
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Hello,

I am faced with a perplexing challenge in analyzing my results for an ecology experiment. All help is immensely appreciated.

The situation:

I have 6-month longitudinal mass data for 8 hummingbirds. From eye-balling the data, time definitely has an effect: masses tend to decrease over time between certain intervals.

I am trying to discern whether a surgical implant has any effect on hummingbird mass. For each bird, the surgery was performed at a DIFFERENT TIME in the 6-month period.

So to recap:

Need to figure out if the implant (of negligible mass) affects hummingbird mass (makes them lose weight etc.). Operations done at different times throughout the year, and birds mass systematically decrease at certain intervals throughout the year.

Any ideas? Thanks so much for the help. I'm thinking ANOVA with covariate of day number... but I'm confused as to how to proceed.
 
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chi-square test for Homogeneity of Population?
 
salzahrah said:
chi-square test for Homogeneity of Population?

I'm confused as to why you would run that particular test.
 

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