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line chart
A line chart or line graph is a type of chart which displays information as a series of data points called 'markers' connected by straight line segments.〔Burton G. Andreas (1965). ''Experimental psychology''. p.186〕 It is a basic type of chart common in many fields. It is similar to a scatter plot except that the measurement points are ordered (typically by their x-axis value) and joined with straight line segments. A line chart is often used to visualize a trend in data over intervals of time – a time series – thus the line is often drawn chronologically. In these cases they are known as run charts.〔Neil J. Salkind (2006). ''Statistics for People who (think They) Hate Statistics: The Excel Edition''. page 106.〕
==History==
Some of the earliest known line charts are generally credited to Francis Hauksbee, Nicolaus Samuel Cruquius, Johann Heinrich Lambert and William Playfair.〔Michael Friendly (2008). ("Milestones in the history of thematic cartography, statistical graphics, and data visualization" ). pp 13–14. Retrieved 7 July 2008.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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