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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