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Table 4 Parameter estimates of the fitted models (M1–M5) and their standard errors, t values and significance (p)

From: Dynamic height growth models for highly productive pedunculate oak (Quercus robur L.) stands: explicit mapping of site index classification in Serbia

Model

Par

Estimate

Standard error

t value

p

M1

\({\beta }_{1}\)

22.21846

2.640614

8.414127

***

\({\beta }_{2}\)

9.105472

0.2967

30.689166

***

\(c\)

1.690559

0.061311

27.573571

***

\({\rho }_{1}\)

0.804632

   

M2

\({\beta }_{1}\)

 − 4.819214

0.959261

 − 5.023882

***

\({\beta }_{2}\)

21.198305

3.387182

6.25839

***

\(c\)

0.028152

0.001047

26.876751

***

\({\rho }_{1}\)

0.788599

   

M3

\({\beta }_{1}\)

7.347052

0.988377

7.43345

***

\({\beta }_{2}\)

 − 1.7448

0.279239

 − 6.248406

***

\(c\)

0.028154

0.001047

26.884978

***

\({\rho }_{1}\)

0.788547

   

M4

\({\beta }_{1}\)

 − 99.295894

34.830912

 − 2.850798

**

\({\beta }_{2}\)

434.709643

130.822338

3.322901

***

\(c\)

0.886917

0.045135

19.65043

***

\({\rho }_{1}\)

0.83759

   

M5

\({\beta }_{1}\)

104.147915

18.576513

5.60643

***

\({\beta }_{2}\)

 − 24.54002

5.157348

 − 4.758264

***

\(c\)

0.333087

0.005972

55.771999

***

\({\rho }_{1}\)

0.81869

2.305662

2.305662

 
  1. *** - p < 0.001; ** - p < 0.01