Table 1.
Coded values of variables used in CCD
| Coded value xi | Independent variables Xi (g/L) |
||
| Urea (i=1) | Na2CO3 (i=2) | MgSO4 (i=3) | |
| −1.68 | 23.18 | 2.64 | 4.64 |
| −1 | 30.00 | 4.00 | 6.00 |
| 0 | 40.00 | 6.00 | 8.00 |
| 1 | 50.00 | 8.00 | 10.00 |
| 1.68 | 56.82 | 9.36 | 11.36 |
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.