Influence Parameters on Nitriding Process of Ferromanganese Alloy

Table 2

Algebraic signs representing the contrast constants for the 2⁴ factorial design.

Treatment combination

Factorial effect

I

A

B

AB

C

AC

BC

ABC

D

AD

BD

ABD

CD

ACD

BCD

ABCD

()

a

b

ab

c

ac

bc

abc

d

ad

bd

abd

cd

acd

bcd

abcd