birthwt: Data Sets in Bayezilla Package

In abnormally-distributed/Bayezilla: Bayesian Models With JAGS and Several Utilities for Data Exploration and Model Evaluation.

Description

List of data sets:

birthwt
demo.dat
demo.dat2
demo.dat3
demo.dat4
diabetes
diabetes2
heart
prostate
wines


Details:

• birthwt is a list containing group IDs, the model matrix, and outcome variable, in a format to be used with the group regression functions. The data consists of 189 observations of 16 predictor variables, and and the response variable of birthweight. All numeric variables are standardized. The data were collected at Baystate Medical Center, Springfield, Mass during 1986. This was created from the data set of the same name in the MASS package.
  
  

• demo.dat, demo.dat2, demo.dat3, and demo.dat4 are data sets generated by me for testing the models in the package. The first and second data sets contain thirty observations of 15 predictor variables and one outcome variable "y", with high degrees of collinearity. This is intended to be used to evaluate regularized regression estimators. The third and fourth data sets contain 60 observations of 11 predictor variables and 1 outcome variable "y". Collinearity is fairly weak in these. The first and third data sets have the outcome variable generated from a sparse set of predictors, such that some of the effects are truly exactly zero. The second and fourth data set outcome variables are generated from non-sparse vectors of true coefficients, such that some effects are small but none are truly exactly zero. For any of these four data sets the true coefficients used to generate the data can be viewed with attr(demo.dat, "true.betas") to assess how accurate a regression model is for these data.
  
  

• diabetes is a data frame containing standardized variables from the diabetes data set in Efron (2004). Contains 11 covariates, one of which is a factor (gender).
  
  

• diabetes2 is a data frame containing standardized variables from the diabetes data set in Schorling et al (1997). The data consists of 403 observations of 16 variables from subjects interviewed in a study to understand the prevalence of obesity, diabetes, and other cardiovascular risk factors in central Virginia for African Americans. Some missing values were imputed by myself using the mice package, and three longitudinal variables were ommitted due to an excessive numer of missing values. This was done so that the data set is easily used for didactic purposes. The original data set can be downloaded from http://biostat.mc.vanderbilt.edu/wiki/Main/DataSets.
  
  

• heart is a data frame containing standardized variables from a sample of males in a heart-disease study conducted in Western Cape, South Africa. There are 462 observations of 10 variables. These data are taken from a larger dataset from Rossouw et al, (1983). The intended outcome variable "chd" is binary, making this useful for logistic regression examples.
  
  

• prostate is a data frame containing standardized variables from a study (Stamey et al., 1989) of the relationship between the level of prostate-specific antigen and a number of clinical measures in men who were about to receive a radical prostatectomy. There are 97 observations of 9 variables.
  
  

• wines is a data frame containing standardized variables from Aeberhard et al. (1992). There are 178 observations 14 variables, one of which is a factor variable with three levels. The data set in its original form can be downloaded from https://archive.ics.uci.edu/ml/datasets/wine.
  

Usage

birthwt

Format

An object of class list of length 3.

References

Aeberhard, S., Coomans, D., and de Vel, O. (1992) Comparison of Classifiers in High Dimensional Settings, Tech. Rep. no. 92-02, Dept. of Computer Science and Dept. of Mathematics and Statistics, James Cook University of North Queensland.

Efron, B., et al. 2004. Least angle regression (with discussion). Ann. Statist. 32:407-499. do:10.1214/009053604000000067

Schorling, J.B., Roach, J., Siegel, M., Baturka, N., Hunt, D.E., Guterbock, T.M., and Stewart, H.L. (1997) A trial of church-based smoking cessation interventions for rural African Americans. Preventive Medicine 26:92-101.

Rossouw, J.E., Du Plessis, J.P., Benade, A.J., Jordaan, P.C., Kotze, J.P., Jooste, P.L., and Ferreira. J.J. (1983). Coronary risk factor screening in three rural communities. The CORIS baseline study. S Afr Med J.: 64(12):430-6.

Stamey, T., Kabalin, J., McNeal, J., Johnstone, I., Freiha, F., Redwine, E. and Yang, N. (1989) Prostate specific antigen in the diagnosis and treatment of adenocarcinoma of the prostate II. Radical prostatectomy treated patients, Journall of Urology 16: 1076 - 1083.

Examples

data(birthwt)

abnormally-distributed/Bayezilla documentation built on Oct. 31, 2019, 1:57 a.m.