Relations of Main-Stem Reservoir Operations and Specific Conductance in the Lower Arkansas River

• Description: Relations of Main-Stem Reservoir Operations and Specific Conductance in the Lower Arkansas River
• State: CO
• Author: Lewis, Michael; Brendle, Daniel
• Title: Relations of Main-Stem Reservoir Operations and Specific Conductance in the Lower Arkansas River
• Water Supply Pro - Doc Type: Report/Study

following information (fig. 2). The horizontal line
inside the box represents the median value (50 percent
of the data are greater than this value and 50 percent of
the data are less than this value). The lower line of the
box is the 25th or lower quartile (25 percent of the data
are less than this value). The upper line of the box is
the 75th percentile or upper quartile (75 percent of
the data are less than this value). The interquartile
range (IQR) contains the values between the 25th
and 75th percentiles and is the difference between
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15
14
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O
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Cr
L 11
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W
LLI 10
LL
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ED
Z) 9
U
Z
3 8
O
J
LL 7
Q
W
Or
F- 6
07
5
4
3
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13
• e
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Figure 2. Example of a boxplot.
the 25th and 75th percentiles. The bottom of the
vertical line on the boxplot is the smallest value within
1.5 times the IQR of the box. The top of the vertical
line is the largest value within 1.5 times the IQR of
the box. Outside values, shown as *, are greater than
1.5 times and less than 3 times the IQR from the box.
The far outside values, shown as O, are greater than
three times the IQR from the box. The number of data
values used to construct each boxplot is presented at
the top of the boxplot.
Number of values
Far outside value— greater than 3.0 times
the interquartile range
3.0 times the interquartile range
Outside value— between 1.5 and 3.0 times
greater than the interquartile range
1.5 times the interquartile range
Between the 75th percentile and 1.5 times
greater than the interquartile range
751h percentile
Median I Interquartile range
25th percentile
Between the 25th percentile and 1.5 times
the interquartile range
1.5 times the interquartile range
Outside value— between 1.5 and 3.0 times
less than the interquartile range
3.0 times the interquartile range
Far outside value —less than 3.0 times
less than the interquartile range
METHODS OF TREND ANALYSIS 7