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r tutorial data beginners r programming introduction plot visualization rstats graph data science rstudio graphics programming manipulation dplyr import range subset text color layout title excel csv read sas font analytics numeric stata round format operators sort spss packages install date github index help tutorials merge variables & | ! all compare objects identical all.equal relational any anyduplicated duplicated stopifnot comparison cut replace nzchar substr string strsplit sub grepl pmatch match tostring grep chartr nchar charmatch jitter floor numbers ceiling abs signif formatc functions >= < > split source read.spss read.dta read.csv read.table read.xls readlines scan readline installed require library remove update r-forge bioconductor rsitesearch apropos rseek example vignette search demo installation clone repository commit version control git within transform rbind cbind append interaction with drop droplevels which order rank t save export output dump writelines sink write write.csv write.table cat sprintf paste0 print paste load read.sas7bdat grammar reshape wrangling verbs readable codes pipes magrittr dataframes tibbles haven spreadsheet readxl datatypes tutoorial big data database rmysql accessibility tables mysql research documents rmarkdown markdown dynamic reproducible barplot visualize univariate bar rollback period duration interval data mining daylight timezones posix time lubridate arules apriori association rule mining market basket analysis rvest web scraping join full join anti join semi join right join left join inner join helpers explore group by mutate summarize arrange select filter labels xlim main axis parameters ylab statistics label exp sample log pmax min cumsum sum prod max rowmeans colsums cummax rowsums cumprod colmeans pmin cummin arithmetic noquote strtrim substring toupper tolower ncol dimnames byrow rows nrow columns matrices matrix coercion missing vectors types logical boolean character float double integer multiple mfrow mfcol combine par mtext annotations cex size col modify ylim xlab