veneer: veneer data in Chapter 7

In WWGbook: Datasets and scripts for WWGbook.

Description

The Dental Veneer data were collected by researchers at the University of Michigan Dental School, in a study investigating the impact of veneer placement on subsequent gingival (gum) health among adult patients (Ocampo, 2005).

Usage

data(veneer)

Format

A data frame with 110 observations on the following 7 variables.

patient

: Patient ID variable (Level 3 ID)

tooth

: Tooth number (Level 2 ID)

age

: Age of patient when veneer was placed, constant for all observations on the same patient

base.gcf

: Baseline measure of Gingival Crevicular Fluid for the tooth, constant for all observations on the same tooth

cda

: Average contour difference in the tooth after veneer placement, constant for all observations on the same tooth

time

: Time points of longitudinal measures (3 = Three Months, 6 = Six Months)

gcf

: Gingival Crevicular Fluid adjacent to the tooth, collected at each time point (Dependent Variable)

References

Ocampo, J., Data taken from M.S. Thesis, Effect of Porcelain Laminate Contour on Gingival Inflammation, University of Michigan School of Dentistry, 2005

West, B., Welch, K. & Galecki, A, Linear Mixed Models: A Practical Guide Using Statistical Software, Chapman Hall / CRC Press, first edition, 2006.

Examples

names(veneer)

Example output

[1] "patient"  "tooth"    "age"      "base.gcf" "cda"      "time"     "gcf"     

WWGbook documentation built on May 2, 2019, 6:01 p.m.