Statistical Analysis of Trends in the Red River Over a 45 Year Period

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CONCENTR
CONCENTR
500 RED RIVER OF THE NORTH AT EMERSON, MANITOBA
dcalc
1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010
POINTS: SEASONALLY ADJUSTED AND FLOW−ADJUSTED DATA
LINE: TREND
1955 1960 196
+ TREND
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1995 2000 2005 2010
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CONCENTRATION, CONCENTRATION, AS BASE−10 BASE−10 LOGARITHM LOGARITHM
1 1 1.5 1.5 2 2 2.5 2.5
POINTS: SEASONALLY ADJUSTED AND DETRENDED DATA
LINE: ANNUAL STREAMFLOW−RELATED ANOMALY
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1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010
Figure A.42: Dissolved Calcium Flow Adjustments — Seasonally adjusted and flow
1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010
adjusted data (points) and single trend (line).
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RESIDUAL
−4 −3 −2 −1 0 1 2 3 4
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1955 1960 196
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DJUSTED DATA
POINTS: PARMA MODEL RESIDUALS
LINE: LOWESS SMOOTH WITH F= 0.5
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1995 2000 2005 2010
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RESIDUAL
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1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010
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Figure A.43: Dissolved Calcium Flow Adjustments — Parametric single trend model
residuals (points) and lowess smooth line with F = 0.5.
79