IDS 702: Module 3.2

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# IDS 702: Module 3.2
## Poisson regression (illustration)
### Dr. Olanrewaju Michael Akande

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## Springbok analysis

The data contains counts of springbok antelope around 25 watering holes.

The data is in the file `springbok.csv` on Sakai.

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## Springbok analysis

- Springbok are counted at each site (hole) at an altitude of 200-300 meters.

- A survey normally includes counts at all 25 sites but occasionally some sites could not be counted because of poor weather.

- For larger groups of springbok, color photographs were taken and springbok were counted later from the photos.

- Several surveys, usually 7-10, were made each year.

- Within a year, springbok are faithful to a single site. That is, if a springbok goes to site `\(i\)` on one day, it will return to site `\(i\)` on other days.

- We want to
  + Analyze trend
  + Estimate the effects of predictors

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## Springbok analysis data

- n = 1050 counts from 1990-2002 for sites 12-21, 23, and 24.

-  The other sites were excluded because they usually don't have many antelope.

- Three time variables: year, date (week) and hour from noon.

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# In-class analysis: move to the R script [here](https://ids702-f21.olanrewajuakande.com/slides/Springbok.R)

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# What's next?

### Move on to the readings for the next module!