welding: Data: Tensile Strength of Welds
Description
This is a highly fractionated two-level factorial design employed as a screening design
in an off-line welding experiment performed by the National Railway Corporation of Japan.
There were 16 runs and 9 experimental factors. The response variable is the observed
tensile strength of the weld, one of several quality characteristics measured. All other
variables are at plus and minus levels.format
A data frame containing the variables.
All the explanatory variables are numeric with two levels, -1
and 1
.
- Rods
{Kind of welding rods}
- Drying
{Period of drying}
- Material
{Welded material}
- Thickness
{Thickness}
- Angle
{Angle}
- Opening
{Opening}
- Current
{Current}
- Method
{Welding method}
- Preheating
{Preheating}
- Strength
{Tensile strength of the weld in kg/mm. The response variable.}source
http://www.statsci.org/data/general/welding.htmlReferences
Smyth, G. K., Huele, F., and Verbyla, A. P. (2001). Exact and approximate REML for heteroscedastic regression. Statistical Modelling 1, 161-175.
Smyth, G. K. (2002). An efficient algorithm for REML in heteroscedastic regression. Journal of Computational and Graphical Statistics 11, 1-12.