wpbc: Wisconsin Prognostic Breast Cancer Data

Description

Each record represents follow-up data for one breast cancer case. These are consecutive patients seen by Dr. Wolberg since 1984, and include only those cases exhibiting invasive breast cancer and no evidence of distant metastases at the time of diagnosis.

Usage

data("wpbc")

Arguments

Format

A data frame with 198 observations on the following 34 variables.

status: a factor with levels N (nonrecur) and R (recur)
time: recurrence time (for status == "R") or disease-free time (for status == "N").
mean_radius: radius (mean of distances from center to points on the perimeter) (mean).
mean_texture: texture (standard deviation of gray-scale values) (mean).
mean_perimeter: perimeter (mean).
mean_area: area (mean).
mean_smoothness: smoothness (local variation in radius lengths) (mean).
mean_compactness: compactness (mean).
mean_concavity: concavity (severity of concave portions of the contour) (mean).
mean_concavepoints: concave points (number of concave portions of the contour) (mean).
mean_symmetry: symmetry (mean).
mean_fractaldim: fractal dimension (mean).
SE_radius: radius (mean of distances from center to points on the perimeter) (SE).
SE_texture: texture (standard deviation of gray-scale values) (SE).
SE_perimeter: perimeter (SE).
SE_area: area (SE).
SE_smoothness: smoothness (local variation in radius lengths) (SE).
SE_compactness: compactness (SE).
SE_concavity: concavity (severity of concave portions of the contour) (SE).
SE_concavepoints: concave points (number of concave portions of the contour) (SE).
SE_symmetry: symmetry (SE).
SE_fractaldim: fractal dimension (SE).
worst_radius: radius (mean of distances from center to points on the perimeter) (worst).
worst_texture: texture (standard deviation of gray-scale values) (worst).
worst_perimeter: perimeter (worst).
worst_area: area (worst).
worst_smoothness: smoothness (local variation in radius lengths) (worst).
worst_compactness: compactness (worst).
worst_concavity: concavity (severity of concave portions of the contour) (worst).
worst_concavepoints: concave points (number of concave portions of the contour) (worst).
worst_symmetry: symmetry (worst).
worst_fractaldim: fractal dimension (worst).
tsize: diameter of the excised tumor in centimeters.
pnodes: number of positive axillary lymph nodes observed at time of surgery.

Details

The first 30 features are computed from a digitized image of a fine needle aspirate (FNA) of a breast mass. They describe characteristics of the cell nuclei present in the image.

There are two possible learning problems: predicting status or predicting the time to recur.

1) Predicting field 2, outcome: R = recurrent, N = non-recurrent - Dataset should first be filtered to reflect a particular endpoint; e.g., recurrences before 24 months = positive, non-recurrence beyond 24 months = negative. - 86.3 previous version of this data.

2) Predicting Time To Recur (field 3 in recurrent records) - Estimated mean error 13.9 months using Recurrence Surface Approximation.

The data are originally available from the UCI machine learning repository, see http://www.ics.uci.edu/~mlearn/databases/breast-cancer-wisconsin/.

Examples

Run this code


    data("wpbc", package = "TH.data")

    ### fit logistic regression model 
    coef(glm(status ~ ., data = wpbc[,colnames(wpbc) != "time"],
             family = binomial()))

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