Environmental Engineering Reference
In-Depth Information
Table 4.4 Characteristics of developed models for Roodak station at Jajroud river (Asadollahfardi et al. 2012 )
Na +
Cl
Ca þþ
Mg þþ
Suggested
Model
ARIMA(1,0,0)(0,0,0)
ARIMA(1,0,0)(0,0,0)
ARIMA(2,0,0)(0,0,0)
ARIMA(2,0,0)(0,0,0)
Equation
Z t = 0.44 + 0.686(Z t 1 )+a t
Z t = 2.24 + 0.586(Z t-
1 )+a t
Z t = 0.912 + 0.635(Z t 1 )
0.188
Z t = 0.295 + 0.662(Z t 1 )
0.163
(Z t 2 )+a t
(Z t 2 )+a t
AIC
355.33
320.57
73.23
425.29
SBC
347.92
327.98
84.34
410.47
R-Square
0.79
0.97
0.59
0.69
Std. Error
0.1332
0.411
0.2718
0.1182
Intercept
0.4367
2.2394
0.912
0.295
T
17.964
12.481
32.223
14.335
Prob > lTl
<.0001
<.0001
<.0001
<.0001
AR Lag1
0.6858
0.5859
0.6346
0.6619
T
16.328
39.183
11.1097
11.539
Prob > lTl
<.0001
<.0001
<.0001
<.0001
AR Lag2
-0.1883
0.1632
-
-
T
-
-
-3.296
2.854
Prob > lTl
-
-
0.001
0.004
SAR Lag12
.
.
-
-
Na +
Cl
Ca þþ
Mg þþ
T
.
.
-
-
Prob > lTl
-
-
.
.
P-Value
0.99
0.99
0.99
0.99
RV
0.0177
0.1692
0.0738
0.0139
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