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90个R入门视频
001 how to download and install r
002 simple shortcuts for the windows r console
003 how to do simple arithmetic in r
004 how to create a variable with r
005 how to use the c (combine) function
006 what does object oriented statistical programming really mean?
007 how to work with data tables in r
008 how to install and load a package in r
009 how to use a function and read the help files in r
010 how to read csv files into r
011 how to create a logical test and then build an if statement in r
012 how to build a for loop in r
013 how to read spss, stata, and sas files into r
014 how to read an excel file (dot xls and dot xlsx) into a data frame with r
015 how to work with character strings in r
016 how to add comments, save a script file, and make your work reproducible in r
017 how to use coercion and convert numbers to characters to logicals in r
018 help resources for r: the rhelp mailing list, ucla academic technology services, and rbloggers
019 how to access different records within a data frame by using logical tests in r
020 how to use the ifelse function in r
021 how to put things together in r: c (combine), paste, the paste collapse parameter, and the outer function
022 how to generate basic descriptive statistics  means, medians, sums, quantiles  on data tables in r
023 how to prevent r from breaking when it hits an error with the try function
024 how to run counts, tables, crosstabs, and flat tables on a data frame in r
025 how to change and recode variables and values in a data table using the fix and transform functions in r
026 how to sort and order stuff in r
027 how to run sql commands on data frames in r with the sqldf package
028 how to merge stuff together using the merge, cbind, rbind, and rbind.fill functions in r
029 how to run analyses across multiple categories of a data table with the tapply and aggregate functions in r
030 what is a function anyway and how does it input and output stuff in r
031 what are the different logical tests that you can conduct in r
032 how to handle NA (missing values) in r: understand and detect NA, remove NA, replace NA with 0
033 what does the %in% operator do and how does it differ from the double equals (==) sign?
034 how to enter your own data by hand and create a data frame in r
035 how to name or rename rows and columns in a data frame in r
036 how to output or export data and write tables to csv files in r
037 how to round a number in r: round, floor, ceiling, even excel_round
038 how to graph simple plots and make scatterplots in r
039 how to draw a line, add points, overlay a plot once it's been created with (lowlevel) plotting functions in r
040 how to remove rows and columns from a data table in r
041 did someone send you a script file or computer code for the r programming language? here's how to run it!
042 how do functions within functions within functions work in r?
043 when and how to use the %in% operator when accessing rows in a data frame that contains missing values in r
044 how and why r repeats an element over and over again without you even knowing it
045 how to bin or categorize or group data into new variables in a data table in r with the ifelse function
046 how to delete or remove variables, objects, data tables, and other stuff from memory in r
047 how many different ways can you slice and dice (subset) a data table in r?
048 how to download a data table or zipped file from the web directly into r, save it locally, then load or open it
049 how to make custom data tables and aggregate data tables with sql commands in r
050 how to count stuff in r and then use those counts to loop through stuff
051 how to read and write excel files with the xlsx package in r
052 how to output or export data tables from r into different formats: dbf, stata, spss, and sas files
053 how to import and export data to and from your windows clipboard with r
054 how to merge data frames onetoone, manytoone, onetomany, manytomany and make sure you did it right in r
055 how to (make or generate or draw or display) a (boxplot or histogram or bar graph or pie chart) in r
056 how to bin or categorize or group data into new variables in a data table or vector in r with the cut function
057 how to use the sample function and sample from a vector or take a random sample of rows from a data frame in r
058 how to use the subset function in r for more intuitive subsets of data frames
059 how to search within a string for matches, substitute stuff in strings, even trim whitespace in a string in r
060 how to output or export data frames in r to a sas transport file (dot xpt) with the write.xport function
061 how to generate a random number in r
062 how to generate random numbers according to different statistical distributions in r
063 how to generate the same random number every time you run a program in r with the set.seed function
064 fun one: how many ancestors did you have in each previous generation?
065 how to title a plot or graph in r, add axes and other text or words with the axis and text functions
066 how to (dynamically) create different objects according to a pattern using the assign function
067 how to (dynamically) retrieve different objects according to a pattern using the get function
068 how and when to load and save your workspace in r
069 how to access the elements of a list object and create your own list variable in r
070 how to nest for loops in r and then debug and troubleshoot them if you hit an error you cannot identify
071 how to create and nest while loops in r
072 how to use the mod (modulus) function in r to calculate a remainder
073 how to run your first regression in r (assuming you know some fancy statistics)
074 how to calculate a variance and standard deviation and then normalize data in r
075 how to clear variables, clear a workspace, clear your screen, even clear unused computer memory in r
076 how to load and then run or execute a script in r with the source function
077 how to time a function or other processes in r like a stopwatch with the Sys.time() command
078 how to initiate empty objects like data tables and matrices in r
079 how the if function (if then) differs from ifelse, singleline if, nested if, and brackets in r
080 how to beautify your r script with formatR and the tidy.source function
081 how to write a for, while, or repeat loop in r with the break and next commands
082 how to test for correlation between two variables in r
083 how to plot residuals from a regression in r (assuming you know some fancy statistics)
084 how to flip a coin or generate a bernoulli or binomial distribution without quaking in fear in r
085 how to export or save a plot in r
086 fun one: what is each country's most current available percent of gross national income spent on education?
087 how to split a character string in r with the strsplit function
088 how to change options and global settings like the number of decimal places shown in r with the options function
089 how to run a block of commands at startup to do stuff like setting your CRAN mirror permanently with r
090 fun one: how to calculate your ten, fifteen, or twenty thousandth day on earth with r
091 fun one: how to make perfect pourover coffee and time your french press steeping with r
