STAT210example4.1: STAT210example4.1: Vascular Graft Experiment

In thoree/stat340: Data and functions for BIAS at NMBU

STAT210example4.1: Vascular Graft Experiment

Description

A medical device manufacturer produces vascular grafts (artificial veins). These grafts are produced by extruding billets of PTFE resin combined with a lubricant into tubes. This data shows the percentage of tubes in the production run that did not contain any defects known as flicks. The product developer investigates the effect of four different levels of extrusion pressure on flicks using a randomized complete block design considering batches of resin as blocks.

Usage

STAT210example4.1

Format

A data frame with 24 observations (rows) and 3 variables (columns).

	Column name	Data type	Description	Values
[,1]	Extrusion_Pressure	factor	The extrusion pressure in PSI	(8500, 8700, 8900, 9100)
[,2]	Batch	factor	6 different resin batches	(1...6)
[,3]	Yield	numeric	Percentage of tubes without any flicks	(78.9 - 98.2)

Details

The data is from Example 4.1 in Design and Analysis of Experiments. 9th Edition, EMEA Edition.

Source

Montgomery, D. C. (2019) Design and Analysis of Experiments, 9th Edition, EMEA Edition. New York: Wiley.

Examples

# A short summary of the variables
summary(STAT210example4.1)

# The levels of extrusion pressure
unique(STAT210example4.1$Extrusion_Pressure)

thoree/stat340 documentation built on June 30, 2024, 4:04 p.m.