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Considering the importance of data accuracy in climate studies, the standard normal homogeneity test (SNHT) and the Mann-Kendall (MK) trend test were applied to the data sets using XLSTAT software (Table 2). The SNHT test was developed by Alexanderson (1986) to detect a change in a series of rainfall data. The purpose of the MK test (Mann 1945; Kendall 1975; Gilbert 1987) is to statistically assess if there is a monotonic upward or downward trend of the variable of interest over time.

Table 2

Results of homogeneity and trend test of selected stations

 SNHT
MK trend test
 
Stationp-valueRisk of rejecting H0 (%)p-valueKendal's tauRisk of rejecting H0 (%)a
Abomoosa Island 0.444 44.39 0.448 −0.03 44.76 0.05 
Bandar Abbas 0.214 21.40 0.085 −0.067 8.46 0.05 
Jask 0.201 20.09 0.310 −0.041 30.95 0.05 
Bandar Lengeh 0.168 16.81 0.446 −0.03 44.57 0.05 
Kish Island 0.159 15.9 0.206 −0.05 20.63 0.05 
Minab 0.640 64.03 0.510 −0.026 50.95 0.05 
 SNHT
MK trend test
 
Stationp-valueRisk of rejecting H0 (%)p-valueKendal's tauRisk of rejecting H0 (%)a
Abomoosa Island 0.444 44.39 0.448 −0.03 44.76 0.05 
Bandar Abbas 0.214 21.40 0.085 −0.067 8.46 0.05 
Jask 0.201 20.09 0.310 −0.041 30.95 0.05 
Bandar Lengeh 0.168 16.81 0.446 −0.03 44.57 0.05 
Kish Island 0.159 15.9 0.206 −0.05 20.63 0.05 
Minab 0.640 64.03 0.510 −0.026 50.95 0.05 

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