The paper investigates the relationship between water hyacinth proliferation and biochemical oxygen demand (BOD) in the Sonso Lagoon using Landsat 8 imagery and in-situ data. It highlights a strong negative correlation (r = -0.83, p < 0.05) between water hyacinth cover and BOD levels, supported by a predictive regression model with an R² of 0.668. Table 5 presents statistically significant coefficients for the regression model predicting BOD based on water hyacinth coverage. However, the absence of residual diagnostics (e.g., normality, homoscedasticity, or independence checks) raises concerns about the model’s robustness. Were these diagnostic tests conducted, and if so, could the authors include a summary or visualization of the residuals to confirm model validity?
