In the case where ANOVA tests for differences among the NPP means, a Tukey honestly significant difference (HSD) post hoc multiple comparison analysis was run to determine the specific means that differed. Next, we also compared the two NPP models per each individual land cover classusing the Paired T-Test. Specifically; we tested the hypotheses that the difference between the MODNPP and Lieth NPP is zero across the individual land cover types.