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--- notes:r_cheat_sheet [2026/09/14 04:16]
5.31.155.199 old revision restored (2026/08/01 18:24)
+++ notes:r_cheat_sheet [2026/09/16 05:33] (current)
43.167.185.137 old revision restored (2026/06/03 01:49)
@@ Line 52: / Line 52: @@
   * A data frame collects sets of related values (i.e. sets of columns with values in the same order) e.g. ''mydf=data.frame(weights,prices,types)''
   * To extract a column, use double-square brackets with the column index or name e.g. ''mydf%%[['weights']]%%'' or just a dollar sign e.g. ''treasure$prices''
+  * ''merge'' merges data sets by joining on shared column names
 ===== Statistics =====
   * ''mean(myvec)  median(myvec)   sd(myvec)''
+  * ''cor.test'' tests for correlation (Pearson's product-moment)
+  * ''line = lm(cola ~ colb)'' calculates a linear model between cola and colb that can be plotted with ''abline(line)''
+  *
 ===== File Handling =====
@@ Line 62: / Line 65: @@
   * ''source("file.R")'' to load file of code
   * ''read.csv('mydat.csv')'' to load a csv file
+  * ''read.table'' to read text data with other separators

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