Table 3.
Repeated measures analysis of variance results for relative growth rates derived from volumes for corn lower- and upper-root systems and the two combined.
| Source | df | Lower roots | df | Upper roots | df | Lower and upper roots combined |
|---|---|---|---|---|---|---|
| P-value | ||||||
| Group† (Weeks 1–2) | 1 | 0.7879 | N/A‡ | N/A | 1 | 0.4178 |
| Group† (Weeks 2–3) | 1 | 0.1252 | 1‡ | 0.0754 | 1 | 0.1449 |
| Between-subject effects | ||||||
| Group | 1 | 0.3040 | 1 | 0.2251 | ||
| Error | 4 | 4 | ||||
| Within-subject effects | ||||||
| Time | 1 | 0.0080 | 1 | 0.0121 | ||
| Time × Group | 1 | 0.1800 | 1 | 0.7376 | ||
| Error (Time) | 4 | 4 | ||||
†Except for N/A, the Error df is 4 (df: number of degrees of freedom).
‡Corn plants of the salt-stressed group had no upper root in Week 1, so relative growth rates based on upper-root volume could be calculated only from Weeks 2–3 for them, limiting the comparison between groups to a classical type of ANOVA (i.e., without repeated measures).