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introtor.review

admin 12月 11, 2020 0

Welcome to R.

Work Flow

Reproduceable Analysis: 可重现分析

How to organize your project?(just some suggestions)

Save the original files others sent to you
Name those original file folders by time
Format data in Excel
A small trick: View -> Freeze Panes
Save Excel files as Excel Workbook, otherwise the format you made won’t be kept.
Don’t edit text files directly
Analysis Files

Today’s Tips:

There’s a programming language in Excel called VBA
R script: like a huge R code chunk. The outputs will be shown in Console window and the graphs will be shown in Plots windows on the right of R Studio.
π in R is pi.

Review of Graphs

Pie Chart

To show the relative proportions.

One-dimentional Graph

Strip Chart

stripchart( rivers,
            main = " Stripchart",
            ylim = c(0, 2),
            xlab = "River Length(miles)",
            method = "jitter",
            jitter = 0.5,
            col = "navy",
            pch = 19,
            cex = 2
)

sample.mean <- mean( rivers )

segments( sample.mean, 0.2,
          sample.mean, 1.8,
          lwd = 3, lty = 2 )

text( sample.mean, 1.9, "Sample Mean" )

Box Plot

boxplot( rivers,
         main = "Box Plot",
         horizontal = TRUE,
         xlab = "River Length(miles)",
         col = "gold")

Histogram

hist( rivers,
      main = "Histogram",
      xlab = "River Length(miles)",
      ylab = "Density",
      probability = TRUE,
      breaks = 30,
      col = "blue")

Stratified Graphs

use “~”.

Two-dimentional Graphs

Scatter Plot

plot( iris$Petal.Width ~ iris$Petal.Length,
      main = "Scatter Plot",
      xlab = "Petal Width (cm)",
      ylab = "Petal Length (cm)",
      pch = 24,
      cex = 1.5,
      bg = "aquamarine2")

regression.model <- lm( iris$Petal.Width ~ iris$Petal.Length )

abline( regression.model, col = "darkblue", lty = 4, lwd = 3 )