Chapter 14 Graphical Representation of Data Flashcards Preview

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Flashcards in Chapter 14 Graphical Representation of Data Deck (16)
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Bar Chart

Chart in which (usually) the X-Axis represents a categorial variable and the Y-Axis can represent frequency, average, percentage etc.


Error Bar

On a bar chart, the vertical line at the top of each bar showing the possible range of error in measurements. The range represented can be +/- one standard deviation, +/- one standard error or a confidence interval for the mean


Line Chart

Chart joining continuous data points in a single line


Time Series

Line chart showing measures of a variable at progressive time intervals



Chart containing whole of continuous data set divided into class intervals with each interval represented by a column proportional to a frequency in the interval


Frequency Polygon

Histogram showing only the peaks of class intervals


Exploratory Data Analysis

Close examination of data by a variety of means, including visual display, before submitting them to significance testing; recommended by Tukey


Stem and Leaf Chart

Exploratory data analysis tool showing every value in a data set but organised into class intervals to give a sideways histogram shape


Cumulative Frequency

Distribution (table or chart) that shows the number of cases that have occurred up to and including the current category



Exploratory data chart showing median, central spread of data and position of relative extremes


Hinge Position

On a box-plot, the lower edge of the box where the first quartile falls and the upper edge where the third quartile falls


Lower Hinge

On a box-plot, the first quartile


Upper Hinge

On a box-plot, the third quartile


Hinge Spread

On a box-plot, the distance between the lower and upper hinges, i.e. the interquartile range (IQR)


Outer Fence

Extreme 'whisker' position on a box-plot being, for the lower fence, lower hinge - 1.5 X IQR, and for the upper fence, upper hinge + 1.5 X IQR. If there are no outliers then the fences are the maximum and minimum values.


Adjacent Value

On a box-plot the first value of the data set inside either of the outer fences, nearer to the median