Bajpai R, Indrayan A
Division of Biostatistics & Medical Informatics, University College of Medical Sciences, Delhi.
Indian J Physiol Pharmacol. 1996 Oct;40(4):330-4.
There are a variety of ways of picturing a frequency distribution type, viz, the histogram, the frequency polygon, the smoothed curve and the ogive. We have developed a computer package to demonstrate gradual change of a histogram into a curve. For a given set of data on frequency distribution of, say blood pressure levels in specified categories, this package helps the computer to draw bars which gradually rise to the level of the frequencies, and lateron are replaced by the polygon and finally by the frequency curve of the Gaussian type on the computer screen pixel by pixel. This thus demonstrates the meaning and genesis of frequency curves. This package could be very useful in learning the concept of frequency curves particularly the Gaussian form.
有多种描绘频率分布类型的方法，即直方图、频率多边形、平滑曲线和累积频率曲线。我们开发了一个计算机程序包来演示直方图如何逐渐转变为曲线。对于给定的一组关于频率分布的数据，比如特定类别中的血压水平，这个程序包能帮助计算机逐像素地绘制逐渐上升到频率水平的条形图，随后这些条形图被多边形取代，最终在计算机屏幕上被高斯型频率曲线取代。这样就展示了频率曲线的含义和起源。这个程序包在学习频率曲线的概念，尤其是高斯形式时可能非常有用。
