Data come from a study of breast cancer in Wisconsin. There are 681 cases of potentially cancerous tumors of which 238 are actually malignant. Determining whether a tumor is really malignant is traditionally determined by an invasive surgical procedure. The purpose of this study was to determine whether a new procedure called fine needle aspiration which draws only a small sample of tissue could be effective in determining tumor status.
A data frame with 681 observations on the following 10 variables.
0 if malignant, 1 if benign
marginal adhesion
bare nuclei
bland chromatin
epithelial cell size
mitoses
normal nucleoli
clump thickness
cell shape uniformity
cell size uniformity
The predictor values are determined by a doctor observing the cells and rating them on a scale from 1 (normal) to 10 (most abnormal) with respect to the particular characteristic.