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Table 1 Trend analysis of temperature using MK1/MK2/MK3 test for Bole and Entoto stations

From: Climate change and trend analysis of temperature: the case of Addis Ababa, Ethiopia

Test

 

Bole Station

Entoto Station

Min Temp

Max Temp

Average Temp

Min Temp

Max Temp

Average Temp

MK1

Test statistic (Z)

5.99

3.32

6.14

1.64

0.85

1.4

P-value (two-tailed)

 < 0.0001

0.001

 < 0.0001

0.101

0.396

0.161

Mann–Kendall stat (S)

405

225

415

84

44

72

Kendall's tau

0.722

0.401

0.74

0.222

0.116

0.19

Alpha

0.05

0.05

0.05

0.05

0.05

0.05

Sen's slope Q

0.0857

0.0256

0.0547

0.0153

0.0228

0.0194

Var (s)

4550

4550

4550

2562

2562

2562

Trend

Increasing

Increasing

Increasing

No significant

No significant

No significant

MK2

Test statistic (Z)

6.21

2.49

6.09

_

0.71

0.17

P-value (two-tailed)

 < 0.0001

0.0126

 < 0.0001

_

0.48

0.87

Mann–Kendall stat (S)

402

162

394

_

35

9

Kendall's tau

0.761

0.306

0.746

_

0.099

0.026

Alpha

0.05

0.05

0.05

_

0.05

0.05

Sen's slope Q

0.0865

0.0157

0.0551

_

0.0099

0.0015

Var (s)

4165

4165

4165

_

2301

2301

Trend

Increasing

Increasing

Increasing

_

No significant

No significant

MK3

Test statistic (Z)

5.99

2.6

6.14

_

0.65

1.04

P-value (two-tailed)

 < 0.0001

0.01

 < 0.0001

_

0.518

0.297

N/N*

1

1.63

1

_

1.73

1.81

Kendall's tau

0.722

0.401

0.722

_

0.116

0.19

Alpha

0.05

0.05

0.05

_

0.05

0.05

Sen's slope Q

0.0857

0.0256

0.0547

_

0.023

0.019

Var (s)

4550

7395

4550

_

4430

4636

Trend

Increasing

Increasing

Increasing

_

No significant

No significant

  1. where N- sample size (total number of observations) and N*—effective sample size