User guide

© GeoWise Ltd. 2011
Page 74
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Variable
Description
Formula
median
The numeric value separating
the higher half of the indicator
values from the lower half.
If x
1
< x
2
< x
3
then:
2
xm 
If x
1
< x
2
< x
3
< x
4
then:
2
32
xx
m


min
The smallest indicator value
-
max
The largest indicator value
-
lower quartile
The 25th percentile. If the
rank
r
is not integer, the
‘Linear Interpolation Between
Closest Ranks’ method is
used.
r
xQ 
1
with
)1(
4
1
 nr
upper quartile
The 75th percentile. If the
rank
r
is not integer, the
‘Linear Interpolation Between
Closest Ranks’ method is
used.
r
xQ 
3
with
)1(
4
3
 nr
interquartile
range
The difference between the
upper and lower quartiles
13
QQIQR 
variance
A measure of the average
distance between each of a set
of data points and their mean
value; equal to the sum of the
squares of the deviation from
the mean value.
 
1
)(
2
2




n
xx

standard
deviation
The square root of the
variance in the units of variable
 
1
)(
2




n
xx

The property ‘Text’ of the Statistic Component in the config.xml file allows
you to amend the displayed statistical figures. By default the value of this
property is:
<p>
sum: ${sum} <br/>
mean: ${mean} <br/>
median: ${median} <br/>
min: ${minValue} <br/>
max: ${maxValue} <br/>
lower quartile: ${lowerQuartile} <br/>
upper quartile: ${upperQuartile} <br/>
interquartile range: ${interquartileRange} <br/>
variance: ${variance} <br/>
standard deviation: ${standardDeviation}
</p>
The Statistics Box in the HTML templates also includes:
Variable
Description
Formula
range
The difference between the
minimum and maximum
values
minmax
xx 