Table 1 Unconditional models used for model selection.

From: Grassland ecosystem responses to climate change and human activities within the Three-River Headwaters region of China

 

log(NPP)

Estimate (CI)

Fixed parts

Intercept

5.135*** (4.59–5.68)

Year

−0.000 (−0.01–0.01)

Year2

0.001*** (0.00–0.00)

Random parts

σ2

0.160

Ï„00, Watershed_ID

1.781

Ï„00, County_ID

1.354

NWatershed_ID

1,817

NCounty_ID

18

ICCWatershed_ID

0.541***

ICCCounty_ID

0.411***

Observations

10,663

R2

0.932

Akaike Information Criterion

17,554.005

  1. Notes: (1) t statistics in parentheses; (2) ***, ** and *denote 1%, 5%, and 10% significance levels, respectively.
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