Dataset: yellow_dye_remove.dat

Source: M.R. Sohrabi, S. Amiri, H.R.F. Masoumi, and M. Moghri (2013).
"Optimization of Direct Yellow 12 Dye Removal by Nanoscale Zero-Valent
Iron Using Response Surface Methodology," Journal of Industrial and
Engineering Chemistry, http://dx.doi.org/10.1016/j.jiec.2013.10.037

Description: Response Surface relating 4 factors to percent removal of yellow 
dye 12. Factors/Levels:
Catalyst Amount (w/w%)   -2=0.1, -1=0.3 0=0.5 1=0.7 2=0.9
pH                -2=2.5, -1=4 0=5.5 1=7 2=8.5
Reaction Time (Sec)  -2=30, -1=60, 0=90 1=120 2=150
Initial Concentration (mg/L)  -2=10, -1=20 0=30 1=40 2=50


Variables/Columns
Run number    7-8
Coded catalyst amount   15-16
Coded pH           23-24
Coded Reaction Time     31-32
Coded Initial Concentration    39-40
Percent Yellow Dye Removal     44-48