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

with those of the non-parametric method and since the non-parametric method tests
for a single linear trend we will examine the single linear trends of the parametric
methods.
For the constituents at the South Floodway monitoring station, a no trend model
was fitted for three constituents, dissolved sulphate, dissolved chloride and specific
conductance. However, since QWTREND has quite specific requirements as stated
earlier, for the South Floodway at St. Norbert and Selkirk monitoring stations the
only constituent with enough data for trend analysis is specific conductance. There
was found to be a 34.9% significant increase in specific conductance from 1976-2007
with a p-value < 0.001 and for the Selkirk monitoring station there was a 30.9%
significant increase in concentration from 1976-2007 with a p-value < 0.001 as well.
Both of these results contradicted the insignificant results obtained by using the
non-parametric methods.
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