Pettitt’s test

Sites

NDVI

VHI

Break date

Averagebeforebreakdate

Averageafterbreakdate

Pettitt’s statistics (U and P-value)

Break date

Averagebeforebreakdate

Averageafterbreakdate

Pettitt’s tstatistics (U and P-value)

Annual data

Syer

2000

0.224

0.248

U = 324

Pv = 6.310⁻⁵

1997

42.47

53.66

U = 304

Pv = 2.210⁻⁴

Tessékere

2004

0.240

0.255

U = 192

Pv = 0.05

2004

46.50

50.52

U = 112

Pv = 0.58

Loughéré-thioly

2004

0.237

0.257

U = 236

Pv = 0.008

2003

41.82

52.01

U = 202

Pv = 0.03

Ballou

2002

0.274

0.288

U = 256

Pv = 0.003

2002

45.81

51.15

U = 162

Pv = 0.15

Growing season

Syer

08/2003

0.255

0.295

U = 1826

Pv = 8.310⁻⁶

10/1997

41.67

54.88

U = 1576

Pv = 1.910⁻⁴

Tessekere

10/2004

0.295

0.320

U = 870

Pv = 0.12

10/1997

44.91

54.68

U = 892

Pv = 0.10

Loughere-thioly

08/2004

0.290

0.321

U = 1150

Pv = 0.01

10/1997

41.86

54.57

U = 1272

Pv = 0.005

Ballou

08/2003

0.38

0.40

U = 760

Pv = 0.23

10/2002

45.82

59.07

U = 1690

Pv = 4.910⁻⁵

Dry season

Syer

07/1997

0.21

0.23

U = 14372

Pv = 7.710⁻¹³

03/1998

42.79

53.38

U = 16216

Pv = 3.110⁻¹⁶

Tessekere

07/1997

0.219

0.23

U = 9199

Pv = 1.610⁻⁵

11/2004

46.14

48.96

U = 9494

Pv = 0.12

Loughere-thioly

07/2003

0.218

0.236

U = 10864

Pv = 1.610⁻⁷

07/2003

40.98

50.59

U = 12222

Pv = 2.110⁻⁹

Ballou

06/2003

0.23

0.251

U = 8172

Pv = 1.910⁻⁴

06/2003

45.44

49.07

U = 5694

Pv = 0.02