sas相关知识
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SAS Iris dataset PlotSAS Day 34: Background Story: Once, in my machine learning class, the professor asked what software do we use for data science? One student answered: "SAS". Then the professor laughed and said: "Oh dear, you must be in the wrong class, nobody uses SAS in data science industry". SAS stands for Statistical Analytic Software, it is most widely used in health-related fields. Although it is known
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SAS MergeSAS Day 22: Merge Background: Sometimes we need to obtain information from different datasets, how do we combine two or more datasets in SAS? Most cases, we use the "Merge" statements, however, depends on the data structures, we need to use SQL if it is many to many mapping. P.S. regardless of Merge or SQL, we need to have at least a specific common variable. Problem: We want to c
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SAS Proc SQL JoinSAS day 24: Proc SQL Join Review: Last time we went to over SAS Merge, it is a SAS Merge statement used for 1 - 1 mapping or One - Many mapping, What should we do for many to many mapping? Problem: Suppose we want to generate a dataset which has the combined info from both dataset A and B. Note: Data A and B both have more than 1 record for each patient. Sample Dummy Dataset: Data
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SAS SpaceSAS Day 24: Space Trick Background: My boss has a motto "Devil in the details". I think all the Space- Related issues are the "Devil" in SAS. Today, we will go over the function and tricks I used to deal with Space. Remove Space: Compress, Compbl, Strip, Trim Concatenate with Remove Space: ||, CAT, CATS, CATX, CATT [caption id="attachment_1626" align="alignnone" width="550"] analogicus / Pixaba
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sas相关教程
- 5.1 软件 SAS 对于商业软件 SAS 而言,虽然它拥有良好的 GUI 方便用户操作,但是购买价格比较昂贵,让很多个体用户望而止步。并且它的统计功能更新速度要不是很及时,而对比之下,Pandas 不仅开源免费,并且功能强大,成为了越来越多个体、科研机构、或者企业的不二之选。
- 5.2 R 库 R 库作为 SAS 的开源对应物,Pandas 库和 R 库在数据处理和分析方面都比较专业,Linux、Windows 均可使用,并且代码可移植性都比较好,两个库之间存在一定的互补性,但处理速度方面 Pandas 库要优于 R 库,Pandas 是 Python 的第三方库,在数据结构上也更为丰富。
- 1. 通过命令行使用 Sass 前面我们讲了 Sass 的安装,假如你在 Ruby 环境下安装了 Sass ,我们可以直接通过命令行来使用 Sass ,Sass 提供了很多命令像编译、配置等等,下面我们写出一些常用的命令供你参考://单个文件转换命令, 将 a.scss 的内容转换为 css 到 b.css 中$ sass a.scss b.css//单文件监听命令,文件发生变化则自动编译$ sass --watch a.scss:b.css// 监听指定的目录$ sass --watch assets/sass:public/styles// 在运行Sass之前加载一个Ruby gem 将内容加载到 Sass 环境中$ sass --require=rails-sass-images style.scss style.css// 加载Compass框架并使其mixin和函数可用于Sas$ sass --compass style.scss style.css// 设置输出格式 $ sass --style=nested // 帮助文档 $ sass --help命令就介绍这么多了,一般我们前端工程师直接在命令行使用 Sass 的情况很少,我们主要还是看下面在前端项目中的使用。
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