Environmental Engineering Reference
In-Depth Information
Table 4.5 (continued)
Na
+
Cl
Ca
þþ
Mg
þþ
SAR
Lag12
.
.
-
.
T
.
.
.
-
Prob > lTl
.
.
.
-
P-value
0.99
0.99
0.99
0.99
RV
0.4994
0.6528
0.45903
0.1759
ME
E
E
E
E
HCO
3
SO
4
pH
TDS
Suggested
model
ARIMA(2,0,0)(0,0,0)
ARIMA(1,0,0)
(0,0,0)
ARIMA(2,0,0)(0,0,0)
ARIMA(2,1,1)(1,0,0)
Equation
Z
t
= 2.45 + 0.987(Z
t-1
)-
0.228(Z
t-2
)+a
t
Z
t
= 1.703 + 0.7
(Z
t-1
)+a
t
Z
t
= 7.775 + 0.842(Z
t-1
)-0.142(Z
t-2
)+a
t
Z
t
= -0.615 + (0.955(Z
t-1
)-0.236(Z
t-
2
). + a
t
-0.995(a
t-1
)) x(0.1499Z
t-12
+
ʵ
t
)
AIC
455.02
914.61
101.15
3549.35
SBC
469.76
925.66
115.88
3571.43
R-square
0.97
0.83
0.77
0.91
Standard
error
0.52
1.139
0.285
101.74
LSW
.
.
.
-
T
.
.
.
-
Prob > lTl
.
.
.
-
SL
.
.
.
-
Intercept
2.447
1.703
7.775
0.615
−
T
17.4681
6.4669
118.086
2.0069
−
Prob > lTl
<.0001
<.0001
<.0001
0.0457
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