Question

In: Math

Determine statistically which two bands are the most correlated? Explain how did you get your answer...

  1. Determine statistically which two bands are the most correlated? Explain how did you get your answer and include intermediate calculations.

105

97

85

82

82

81

108

104

93

82

81

81

106

109

102

88

81

81

106

108

103

89

84

81

105

106

104

95

89

83

104

102

98

94

90

86

Green

128

115

95

89

89

90

129

124

109

94

89

89

128

133

125

102

93

89

129

134

124

101

95

90

130

128

126

112

104

92

128

125

118

108

104

96

Red

102

97

91

91

91

92

104

101

96

92

90

90

103

106

100

92

90

89

102

106

101

93

92

89

102

103

102

97

95

90

101

99

98

99

98

94

NIR

Solutions

Expert Solution

the correlation matrix is calculated and given as

Green red NIR
Green 1
red 0.9953 1
NIR 0.9750 0.9681 1

correlation between Green and red is highest=r1=0.9953

r1=(n*sum(xy)-sum(x)*sum(y))/sqrt((n*sum(x2)-(sum(x))2)*(n*sum(y2)-(sum(y))2)=0.9953

and same as for r2 and r3

s.n. green(x) red(y) NIR(z) x2 y2 z2 xy xz yz
1 105 128 102 11025 16384 10404 13440 10710 10710
2 108 129 104 11664 16641 10816 13932 11232 11232
3 106 128 103 11236 16384 10609 13568 10918 10918
4 106 129 102 11236 16641 10404 13674 10812 10812
5 105 130 102 11025 16900 10404 13650 10710 10710
6 104 128 101 10816 16384 10201 13312 10504 10504
7 97 115 97 9409 13225 9409 11155 9409 9409
8 104 124 101 10816 15376 10201 12896 10504 10504
9 109 133 106 11881 17689 11236 14497 11554 11554
10 108 134 106 11664 17956 11236 14472 11448 11448
11 106 128 103 11236 16384 10609 13568 10918 10918
12 102 125 99 10404 15625 9801 12750 10098 10098
13 85 95 91 7225 9025 8281 8075 7735 7735
14 93 109 96 8649 11881 9216 10137 8928 8928
15 102 125 100 10404 15625 10000 12750 10200 10200
16 103 124 101 10609 15376 10201 12772 10403 10403
17 104 126 102 10816 15876 10404 13104 10608 10608
18 98 118 98 9604 13924 9604 11564 9604 9604
19 82 89 91 6724 7921 8281 7298 7462 7462
20 82 94 92 6724 8836 8464 7708 7544 7544
21 88 102 92 7744 10404 8464 8976 8096 8096
22 89 101 93 7921 10201 8649 8989 8277 8277
23 95 112 97 9025 12544 9409 10640 9215 9215
24 94 108 99 8836 11664 9801 10152 9306 9306
25 82 89 91 6724 7921 8281 7298 7462 7462
26 81 89 90 6561 7921 8100 7209 7290 7290
27 81 93 90 6561 8649 8100 7533 7290 7290
28 84 95 92 7056 9025 8464 7980 7728 7728
29 89 104 95 7921 10816 9025 9256 8455 8455
30 90 104 98 8100 10816 9604 9360 8820 8820
31 81 90 92 6561 8100 8464 7290 7452 7452
32 81 89 90 6561 7921 8100 7209 7290 7290
33 81 89 89 6561 7921 7921 7209 7209 7209
34 81 90 89 6561 8100 7921 7290 7209 7209
35 83 92 90 6889 8464 8100 7636 7470 7470
36 86 96 94 7396 9216 8836 8256 8084 8084
sum 3375 3954 3478 320145 443736 337020 376605 327954 327954

here we use t-test and statistic would be t =r/sqrt((1—r2)/(n—2)) with df is n-2=16-2=34

for Green and Red the correlation r1=0.9953, t=0.9953/sqrt((1-0.9953*0.9953)/(36-2))=59.93 with 34 df

for Green and NIR the correlation r2=0.975, t=0.975/sqrt((1-0.975*0.975)/(36-2))=25.59 with 34 df

for Green and Red the correlation r3=0.9681 t=0.9681/sqrt((1-0.9681*0.9681)/(36-2))=22.53 with 34 df

typical critical t(0.05,34)=2.03 is less than above calculated t, so there is significant correlation coefficient i.e. r1,r2 and r3 are significant


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