gallfly: Truncated counts of gallfly eggs and gall-cells.
In trobinj/trtools: Miscellaneous Tools for Teaching Statistics
gallfly R Documentation
Truncated counts of gallfly eggs and gall-cells.
Description
Data from a study that investigated the number of eggs and gall-cells from gall flies (Urophora jaceana) during two seasons in the flower heads of knapweed (Centaurea nemoralis).
Usage
gallfly
Format
A data frame 1411 observations and three variables:
- y:
number of eggs or gall-cells
- year:
year of observations (1935 or 1936)
- stage:
developmental stage observed (egg or gall)
Note
These data were used by Finney and Varley (1955) as an example for modeling using a truncated Poisson distribution. For reasons that are not entirely clear, no flower heads with zero eggs or gall-cells were reported. The original source of the data is Varley (1947).
Source
Finney, D. J. & Varley, G. C. (1955). An example of the truncated Poisson distribution. Biometrics, 11, 387-394.
Varley, G. C. (1947). The natural control of population balance in the knapweed gall-fly (Erophora jaceana). Journal of Animal Ecology, 16, 139-187.
trobinj/trtools documentation built on Jan. 28, 2024, 3:20 a.m.
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| gallfly | R Documentation |
Truncated counts of gallfly eggs and gall-cells.
Description
Data from a study that investigated the number of eggs and gall-cells from gall flies (Urophora jaceana) during two seasons in the flower heads of knapweed (Centaurea nemoralis).
Usage
gallfly
Format
A data frame 1411 observations and three variables:
- y:
number of eggs or gall-cells
- year:
year of observations (1935 or 1936)
- stage:
developmental stage observed (egg or gall)
Note
These data were used by Finney and Varley (1955) as an example for modeling using a truncated Poisson distribution. For reasons that are not entirely clear, no flower heads with zero eggs or gall-cells were reported. The original source of the data is Varley (1947).
Source
Finney, D. J. & Varley, G. C. (1955). An example of the truncated Poisson distribution. Biometrics, 11, 387-394.
Varley, G. C. (1947). The natural control of population balance in the knapweed gall-fly (Erophora jaceana). Journal of Animal Ecology, 16, 139-187.
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Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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