I need to find the effect of treatments on mortality rate of insects. My dependent variable is mortality rate and my independent variable is treatments. Each treatment was replicated 4 times. The exposure times of the treatments are different, but, within a treatment, the exposure times are the same. When I conducted one-way ANOVA without considering the time effect, I see treatments have a significant effect on the survival. However, the exposure time also affect the dependent variable mortality. I tried separating the effect of time using multiple logistic regression and ANOVA. However, I think the program identifies time and treatment both as a single variable. Please see the attached data sheet. Any advise on this would be much appreciated.
Death rate | Treatment | Time (days) |
0.3 | R2 | 8 |
0.1 | R2 | 8 |
0.1 | R2 | 8 |
0.4 | R2 | 8 |
0.7 | R4 | 16 |
0.7 | R4 | 16 |
0.7 | R4 | 16 |
0.7 | R4 | 16 |
0.9 | R6 | 24 |
0.8 | R6 | 24 |
0.8 | R6 | 24 |
0.9 | R6 | 24 |