1. Labs: Dimension Reduction, Factor Analysis
Peter Fox
Data Analytics – ITWS-4600/ITWS-6600/MATP-4450
Group 3 Lab 3, March 22, 2018

2. Factor Analysis, DR group3/
lab3_fa1.R
lab3_dr1.R # real life research example

3. Glass
index <- 1:nrow(Glass) testindex <- sample(index, trunc(length(index)/3)) testset <- Glass[testindex,] trainset <- Glass[-testindex,] # you’ve used this for classification, now…. cor(Glass[,-10]) prcomp(Glass[,-10]) Factor Analysis? How many factors? Dimension reduction?

4. SPSS files On web page: html/DA
personality.sav, and SAQ.sav (Band Personality.sav)
require(psych);
require(foreign);
# Import data from SPSS data file.personality <- foreign::read.spss("personality.sav", to.data.frame = TRUE)
Explore with psych:VSS routines
Do factor analysis, looking for ~ 5 factors, use rotation