Commands
|
Purpose
|
| help() | Obtain documentation for a given R command |
| example() | View some examples on the use of a command |
| c(), scan() | Enter data manually to a vector in R |
| seq() | Make arithmetic progression vector |
| rep() | Make vector of repeated values |
| data() | Load (often into a data.frame) built-in dataset |
| View() | View dataset in a spreadsheet-type format |
| str() | Display internal structure of an R object |
| read.csv(), read.table() | Load into a data.frame an existing data file |
| library(), require() | Make available an R add-on package |
| dim() | See dimensions (# of rows/cols) of data.frame |
| length() | Give length of a vector |
| ls() | Lists memory contents |
| rm() | Removes an item from memory |
| names() | Lists names of variables in a data.frame |
| hist() | Command for producing a histogram |
| histogram() | Lattice command for producing a histogram |
| stem() | Make a stem plot |
| table() | List all values of a variable with frequencies |
| xtabs() | Cross-tabulation tables using formulas |
| mosaicplot() | Make a mosaic plot |
| cut() | Groups values of a variable into larger bins |
| mean(), median() | Identify “center” of distribution |
| by() | apply function to a column split by factors |
| summary() | Display 5-number summary and mean |
| var(), sd() | Find variance, sd of values in vector |
| sum() | Add up all values in a vector |
| quantile() | Find the position of a quantile in a dataset |
| barplot() | Produces a bar graph |
| barchart() | Lattice command for producing bar graphs |
| boxplot() | Produces a boxplot |
| bwplot() | Lattice command for producing boxplots |
| help() | Obtain documentation for a given R command |
| example() | View some examples on the use of a command |
| c(), scan() | Enter data manually to a vector in R |
| seq() | Make arithmetic progression vector |
| rep() | Make vector of repeated values |
| data() | Load (often into a data.frame) built-in dataset |
| View() | View dataset in a spreadsheet-type format |
| str() | Display internal structure of an R object |
| read.csv(), read.table() | Load into a data.frame an existing data file |
| library(), require() | Make available an R add-on package |
| dim() | See dimensions (# of rows/cols) of data.frame |
| length() | Give length of a vector |
| ls() | Lists memory contents |
| rm() | Removes an item from memory |
| names() | Lists names of variables in a data.frame |
| hist() | Command for producing a histogram |
| histogram() | Lattice command for producing a histogram |
| stem() | Make a stem plot |
| table() | List all values of a variable with frequencies |
| xtabs() | Cross-tabulation tables using formulas |
| mosaicplot() | Make a mosaic plot |
| cut() | Groups values of a variable into larger bins |
| mean(), median() | Identify “center” of distribution |
| by() | apply function to a column split by factors |
| summary() | Display 5-number summary and mean |
| var(), sd() | Find variance, sd of values in vector |
| sum() | Add up all values in a vector |
| quantile() | Find the position of a quantile in a dataset |
| barplot() | Produces a bar graph |
| barchart() | Lattice command for producing bar graphs |
| boxplot() | Produces a boxplot |
| bwplot() | Lattice command for producing boxplots |
| plot() | Produces a scatterplot |
| xyplot() | Lattice command for producing a scatterplot |
| lm() | Determine the least-squares regression line |
| anova() | Analysis of variance (can use on results of lm()) |
| predict() | Obtain predicted values from linear model |
| nls() | estimate parameters of a nonlinear model |
| residuals() | gives (observed - predicted) for a model fit to data |
| sample() | take a sample from a vector of data |
| replicate() | repeat some process a set number of times |
| cumsum() | produce running total of values for input vector |
| ecdf() | builds empirical cumulative distribution function |
| dbinom(), etc. | tools for binomial distributions |
| dpois(), etc. | tools for Poisson distributions |
| pnorm(), etc. | tools for normal distributions |
| qt(), etc. | tools for student t distributions |
| pchisq(), etc. | tools for chi-square distributions |
| binom.test() | hypothesis test and confidence interval for 1 proportion |
| prop.test() | inference for 1 proportion using normal approx. |
| chisq.test() | carries out a chi-square test |
| fisher.test() | Fisher test for contingency table |
| t.test() | student t test for inference on population mean |
| qqnorm(), qqline() | tools for checking normality |
| addmargins() | adds marginal sums to an existing table |
| prop.table() | compute proportions from a contingency table |
| par() | query and edit graphical settings |
| power.t.test() | power calculations for 1- and 2-sample t |
| anova() | compute analysis of variance table for fitted model |