# Leukemia in an eight-county region of upstate New York, 1978-1982.

### Description

This data set provides the number of incident leukemia cases per census tract in an eight-county region of upstate New York in the period 1978-1982. In addition, the data set also includes information about the location of the census tracts, the population in 1980, the inverse of the distance to the nearest Trichloroethene (TCE) site, the percentage of people aged 65 or more, and the percentage of people who own their home.

The dataset also provides the locations of the TCE sites.

### Usage

1 | ```
data(NY8)
``` |

### Format

A SpatialPolygonsDataFrame with 281 polygons representing the census tracts, and the following information about each census tract:

AREANAME | Name |

AREAKEY | Identifier |

X | x coordinate |

Y | y coordinate |

POP8 | Population in 1980 |

TRACTCAS | Number of leukemia cases rounded to 2 decimals |

PROPCAS | Ratio of the number of leukemia cases to the population in 1980 |

PCTOWNHOME | Percentage of people who own their home |

PCTAGE65P | Percentage of people aged 65 or more |

Z | |

AVGIDIST | |

PEXPOSURE | Inverse of the distance to the nearest TCE site |

Cases | Number of leukemia cases |

Xm | x coordinate (in meters) |

Ym | y coordinates(in meters) |

Xshift | Shifted Xm coordinate |

Yshift | Shifted Ym coordinate |

### Source

Waller and Gotway (2004) and Bivand et al. (2008)

### References

Bivand, R.S., E. J. Pebesma and V. Gómez-Rubio (2008). Applied Spatial Data Analysis with R. Springer.

Waller, L., B. Turnbull, L. Clark, and P. Nasca (1992). Chronic disease surveillance and testing of clustering of disease and exposure: application to leukemia incidence in tce-contamined dumpsites in upstate New York. Environmetrics 3, 281-300

Waller, L. A. and C. A. Gotway (2004). Applied Spatial Statistics for Public Health Data. John Wiley & Sons, Hoboken, New Jersey. http://www.sph.emory.edu/~lwaller/WGindex.htm