Exploring with Data

• str - The structure of the data frame
• head - The first six rows of the data frame
• tail - The last six rows of the data frame
• View - View the data frame in a spreasheet view
• dim - Dimensions of the data frame
• nrow - Number of rows in the data frame
• ncol - Number of columns in the data frame
• subset - Subset a data frame or vector

Descriptive Statistics

• mean - Mean (or average)
• sd - Standard deviation
• median - Median
• IQR - Inter-quartile range
• table - Contingency table
• prop.table - Proportional table (note takes the results of table as a parameter)
• psych::describe - Common descriptive statistics
• psych::describeBy - Common descriptive statistics by a grouping (qualitative) variable
• cor - Correlation

Plots

• Data ggplot(myDataFrame, aes(x=x, y=y)
• Layers geom_point(), geom_histogram(), geom_bar(), geom_boxplot(), geom_text()
• Facets facet_wrap(~ cut), facet_grid(~ cut)
• Scales scale_y_log10()
• Other options ggtitle('my title'), ylim(c(0, 10000)), xlab('x-axis label')