melanoma {fic}

Malignant melanoma survival data

Description

Data originally analysed by Andersen et al (1993) on the survival of 205 patients in Denmark with malignant melanoma, and used by Claeskens and Hjort (2008) to illustrate focused model selection in Cox regression.

Usage

melanoma

Format

A data frame with 205 rows and the following columns:

ptno

Patient identification number

death

Survival status: 1 = dead from illness, 2 = censored, 4 = dead from other causes

days

Survival time in days

depth

Invasion depth: factor with levels 1, 2, 3

infilt

Infection infiltration level, a measure of resistance to the tumour: factor with levels 1 (high resistance), 2, 3, 4 (low resistance)

epith

Indicator for epithelioid cells present

ulcer

Indicator for ulceration

thick

Thickness of the tumour in 1/100 mm

sex

Sex. Factor with levels "female","male" and reference level "female"

age

Age in years

years

Survival time in years (instead of days)

thick_centred

Version of thick centred around its mean and rescaled, defined as (thick - 292)/100.

Source

The supporting material from Claeskens and Hjort (2008), at https://feb.kuleuven.be/public/u0043181/modelselection/datasets/melanoma_data.txt. Versions of this dataset are also given in the MASS and boot packages.

References

Claeskens, G., & Hjort, N. L. (2008). Model selection and model averaging (Vol. 330). Cambridge: Cambridge University Press.

Andersen, P. K., Borgan, O., Gill, R. D., & Keiding, N. (2012). Statistical models based on counting processes. Springer.