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@ -4,22 +4,21 @@ author: 姓名
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format: html
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---
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# 示例问题,在R中输出`1+2+3+...+100`的结果
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采用`for`循环完成,代码如下:
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# 下载airquality.xlsx,并读取数据
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```{r}
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total <- 0
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for (i in 1:100) {
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total <- total + i
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}
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total
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# 下载至临时文件
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tmpxlsxpath <- file.path(tempdir(), "airquality.xlsx")
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download.file("https://drwater.rcees.ac.cn/git/course/RWEP/raw/branch/PUB/data/airquality.xlsx",
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destfile = tmpxlsxpath)
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airqualitydf <- readxl::read_xlsx(tmpxlsxpath, sheet = 1)
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metadf <- readxl::read_xlsx(tmpxlsxpath, sheet = 2)
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```
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# 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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# 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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@ -24,7 +24,7 @@ website:
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page-navigation: true
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page-footer: "Copyright 2024, [Ming Su](https://drwater.rcees.ac.cn)"
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navbar:
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background: "grey"
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background: "light"
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search: true
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right:
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- icon: house
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