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ID:5547156
大小:4.32 MB
页数:103页
时间:2017-11-16
《医学统计学 定量资料的统计描述》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、第二章:定量资料的统计描述引子:变量统计学医学统计学研究方法定性资料定量资料统计描述统计推断随机性现象概率论数理统计例2-2抽样调查某地120名18~35岁健康男性居民血清铁含量(μmol/L),数据如下:7.428.6523.0221.6121.3121.469.9722.7314.9420.1821.6223.0720.388.4017.3229.6419.6921.6923.9017.4519.0820.5224.1423.7718.3623.0424.2224.1321.5311.0918.8918.2623.2917.6715.3818.611
2、4.2717.4022.5517.5516.1017.9820.1321.0014.5619.8919.8217.4814.8918.3719.5017.0818.1226.0211.3413.8110.2515.9415.8318.5424.5219.2626.1316.9918.8918.4620.8717.5113.1211.7517.4021.3617.1413.7712.5020.4020.3019.3823.1112.6723.0224.3625.6119.5314.7714.3724.7512.7317.2519.0916.7917.191
3、9.3219.5919.1215.3121.7519.4715.5110.8627.8121.6516.3220.7522.1113.1717.5519.2612.6518.4819.8323.1219.2219.2216.7227.9011.7424.6614.1816.52目的:提取该组男性居民血清铁的分布信息。问题1.该组男性血清铁是怎样分布的?问题2.血清铁主要集中在哪个范围?频数表频数分布图问题4.变异情况?最高?最低?问题3.该组男性血清铁的平均水平?离散趋势集中趋势统计描述:从数据资料中获取信息最基本的方法把握资料基本的特征为统计分析打下基
4、础频率表与频率分布图描述性统计指标统计表与统计图包括集中趋势的描述离散趋势的描述第一节频率分布表与频率分布图频数(frequency):指在一个抽样资料中,某变量值出现的次数。(一)离散型定量变量的频率分布:例2-11998年某山区96名孕妇产前检查次数资料:0,3,2,0,1,5,6,3,2,4,1,0,6,5,1,3,3,…,4,7频率分布表(frequencydistributiontable):将当变量值的个数较多时,对各变量出现的频率列表即为频率分布表,简称频率表。频率是表示频数出现机率的指标,可用百分数或小数表示,频率的和为100%或1。.频
5、数表作用:简化数据,方便阅读;显示数据的分布类型和分布特征。频率直条图(frequencydistributionfigure):根据频数分布表,以变量值为横坐标,频数为纵坐标,绘制的直方图。图2-1某地96名妇女产前检查次数频率分布频率(%)产前检验次数例2-2抽样调查某地120名18~35岁健康男性居民血清铁含量(μmol/L),数据如下:7.428.6523.0221.6121.3121.469.9722.7314.9420.1821.6223.0720.388.4017.3229.6419.6921.6923.9017.4519.0820.522
6、4.1423.7718.3623.0424.2224.1321.5311.0918.8918.2623.2917.6715.3818.6114.2717.4022.5517.5516.1017.9820.1321.0014.5619.8919.8217.4814.8918.3719.5017.0818.1226.0211.3413.8110.2515.9415.8318.5424.5219.2626.1316.9918.8918.4620.8717.5113.1211.7517.4021.3617.1413.7712.5020.4020.3019.382
7、3.1112.6723.0224.3625.6119.5314.7714.3724.7512.7317.2519.0916.7917.1919.3219.5919.1215.3121.7519.4715.5110.8627.8121.6516.3220.7522.1113.1717.5519.2612.6518.4819.8323.1219.2219.2216.7227.9011.7424.6614.1816.52求全距列表划记步骤:写组段定组距7.428.6523.0221.6121.3121.469.9722.7314.9420.1821.6223.
8、0720.388.4017.3229.6419.6921.6923.9017.4
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