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---
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title: "课后作业8"
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format:
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dwsd-revealjs:
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logo: _extensions/drwater/dwsd/inst/ucaslogo.png
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---
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```{r}
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#| include: false
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#| cache: false
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lang <- "cn"
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require(tidyverse)
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require(learnr)
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```
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## 第8次课后作业
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1. 根据`airqualitydf.xlsx`,按采样点统计白天(8:00-20:00)与夜晚(20:00-8:00)中空气质量指数(AQI)中位数,按城市统计低于所有采样点AQI30%分位值的采样点占比,列出上述占比最高的10个城市(不考虑采样点数低于5个的城市)。
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2. 按照不同城市分组,统计白天与夜晚AQI中位数是否具有显著差异。
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作业模板:[第8次课后作业_模板.qmd](https://git.drwater.net/course/RWEP/raw/branch/main/SD/20240328_9_课后作业/第8次课后作业_模板.qmd)
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## 示例代码
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### 基于R的示例结果
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- [第8次课后作业R示例代码结果](./第8次课后作业_模板.html)
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### 基于SAS的示例结果
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- [第8次课后作业SAS示例代码](./第8次课后作业_模板.sas)
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- [第8次课后作业SAS示例结果1](./median.pdf)
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- [第8次课后作业SAS示例结果2](./freq.pdf)
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- [第8次课后作业SAS示例结果3](./airqualitymedianoutrow5.pdf)
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- [第8次课后作业SAS示例结果4](./npar1wayConover.pdf)
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## 欢迎讨论!{.center}
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```{r}
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#| results: 'asis'
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rmdify::slideend(
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wechat = FALSE,
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type = "public",
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tel = FALSE,
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thislink = "../"
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)
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```
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