Environmental Engineering Reference
In-Depth Information
Table 4.5 Characteristics of developed models for Ali-Abad station in Lavark river (Asadollahfardi et al.
2012
)
Na
+
Cl
Ca
þþ
Mg
þþ
Suggested
model
ARIMA(2,0,0)(0,0,0)
ARIMA(1,0,0)
(0,0,0)
Simple Exponential Smoothing
ARIMA(2,0,0)(0,0,0)
Equation
Z
t
= 1.13 + 0.829 (Z
t
−
1
)
Z
t
= 2.66 + 0.647
(Z
t
−
1
)+a
t
S
t
= 0.999Y
t
−
1
+(1
0.999)S
t
−
1
in above
equation: S Prediction and Y Observation
Z
t
= 0.869 + 0.917(Z
t
−
1
)
0.153(Z
t
−
−
0.189 (Z
t
−
2
)+a
t
−
2
)+a
t
−
AIC
634.93
712.51
232.591
328.59
−
SBC
649.66
723.56
−
228.88
343.33
R-square
0.86
0.88
0.72
0.95
Std. error
0.7066
0.8079
0.0409
0.4195
LSW
.
.
0.999
.
T
.
.
24.4298
.
Prob > lTl
.
.
<.0001
.
SL
.
.
0.69
.
Intercept
1.13018
2.6573
-
0.86873
T
7.7518
15.799
7.555
-
Prob > lTl
<.0001
<.0001
<.0001
-
AR Lag1
0.82969
0.64663
-
0.91671
T
14.1942
14.4323
-
15.807
Prob > lTl
<.0001
<.0001
<.0001
-
AR Lag2
−
0.18931
.
−
0.15305
-
T
−
3.2364
.
-
−
2.6354
Prob > lTl
0.00135
.
0.0088
-
MA1
.
.
.
-
T
.
.
-
.
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