9.1 Exploration Setup

20200317 Packages used in this chapter include dplyr (Wickham et al. 2021), magrittr (Bache and Wickham 2020), and rattle (G. Williams 2021).

Packages are loaded into the currently running R session from your local library directories on disk. Missing packages can be installed using utils::install.packages() within R. On Ubuntu, for example, R packages can also be installed using $ wajig install r-cran-<pkgname>.

# Load required packages from local library into the R session.

library(dplyr)        # Wrangling: select() sample_frac().
library(magrittr)     # Data pipelines: %>% %<>% %T>% equals().
library(rattle)       # normVarNames(). Dataset: weather.

The rattle::weatherAUS dataset is loaded into the template variable ds and further template variables are setup as introduced by Graham J. Williams (2017). See Chapter 8 for details.

dsname <- "weatherAUS"
ds     <- get(dsname)
    
nobs   <- nrow(ds)

vnames <- names(ds)
ds    %<>% clean_names(numerals="right")
names(vnames) <- names(ds)

vars   <- names(ds)
target <- "rain_tomorrow"
vars   <- c(target, vars) %>% unique() %>% rev()

A random sample of the dataset:

ds %>% sample_frac()

## # A tibble: 191,431 x 24
##    date       location      min_temp max_temp rainfall evaporation sunshine
##    <date>     <chr>            <dbl>    <dbl>    <dbl>       <dbl>    <dbl>
##  1 2019-01-05 NorfolkIsland     19.5     26.2      0           7.8     NA  
##  2 2015-03-11 Cobar             21.9     35.2      0          11.6     NA  
##  3 2015-10-02 SydneyAirport     16.9     23.5      0           4.8     10.5
##  4 2012-03-03 PearceRAAF        18.3     33.1      0          NA       11.3
##  5 2013-06-09 SydneyAirport     11.1     20.5      0           7        6.9
##  6 2014-10-22 Brisbane          16.6     25.5      0           7.8      9.2
##  7 2014-10-09 Launceston         6.2     18.1      1          NA       NA  
##  8 2019-09-30 NorfolkIsland     17.6     20.7      3.4         3.2     NA  
##  9 2017-06-23 Adelaide           5.4     18.5      0          NA       NA  
## 10 2010-07-17 Townsville        13.3     25.3      0           6.4     10.7
## # … with 191,421 more rows, and 17 more variables: wind_gust_dir <ord>,
## #   wind_gust_speed <dbl>, wind_dir_9am <ord>, wind_dir_3pm <ord>,
## #   wind_speed_9am <dbl>, wind_speed_3pm <dbl>, humidity_9am <int>,
## #   humidity_3pm <int>, pressure_9am <dbl>, pressure_3pm <dbl>,
## #   cloud_9am <int>, cloud_3pm <int>, temp_9am <dbl>, temp_3pm <dbl>,
## #   rain_today <fct>, risk_mm <dbl>, rain_tomorrow <fct>

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