skylark: Impact of pesticides on skylark reproductivity.
In trobinj/trtools: Miscellaneous Tools for Teaching Statistics
skylark R Documentation
Impact of pesticides on skylark reproductivity.
Description
The data are from a cross-over design in which four fields were either sprayed or not on each of four consecutive years. For each field on each year, the number of skylark fledglings produced was recorded.
Usage
skylark
Format
A data frame with 16 observations and four variables:
- year:
year on which the observation was made
- field:
identifier for the field
- spray:
was the field sprayed that year?
- count:
number of skylark fledglings
Details
These data are from a study discussed by Odderskær et al. (1997) and were featured in Tjur's (1998) article on overdispersion in generalized linear models.
Source
Odderskær, P., Prang, A., Eknegaard, N., & Andersen, P. N. (1997). Skylark reproduction in pesticide treated fields (Comparative studies of Alauda arvensis breeding performance in sprayed and unsprayed barley fields). Bekæmpelsesmiddelforskning fra Miljøstyrelsennr. 32, National Environmental Research Institute, Ministry of the Environmnent and Energy, Denmark: Danish Environmental Protection Agency.
Tjur, T. (1998). Nonlinear regression, quasi likelihood, and overdispersion in generalized linear models. American Statistician, 52, 222-227.
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| skylark | R Documentation |
Impact of pesticides on skylark reproductivity.
Description
The data are from a cross-over design in which four fields were either sprayed or not on each of four consecutive years. For each field on each year, the number of skylark fledglings produced was recorded.
Usage
skylark
Format
A data frame with 16 observations and four variables:
- year:
year on which the observation was made
- field:
identifier for the field
- spray:
was the field sprayed that year?
- count:
number of skylark fledglings
Details
These data are from a study discussed by Odderskær et al. (1997) and were featured in Tjur's (1998) article on overdispersion in generalized linear models.
Source
Odderskær, P., Prang, A., Eknegaard, N., & Andersen, P. N. (1997). Skylark reproduction in pesticide treated fields (Comparative studies of Alauda arvensis breeding performance in sprayed and unsprayed barley fields). Bekæmpelsesmiddelforskning fra Miljøstyrelsennr. 32, National Environmental Research Institute, Ministry of the Environmnent and Energy, Denmark: Danish Environmental Protection Agency.
Tjur, T. (1998). Nonlinear regression, quasi likelihood, and overdispersion in generalized linear models. American Statistician, 52, 222-227.
R Package Documentation
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