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Japanese version. Just on a middle of way.
2014-07-16 05:51:56 +00:00
---
language: R
contributors:
- ["e99n09", "http://github.com/e99n09"]
- ["isomorphismes", "http://twitter.com/isomorphisms"]
translators:
- ["akirahirose", "https://www.facebook.com/akira.hirose"]
filename: learnr-jp.r
lang: ja-jp
---
R は統計計算用の言語です。
データの取得やクリーニング、統計処理やグラフ作成をするために使える、たくさんのライブラリがあります。また、LaTeX文書からRコマンドを呼び出すこともできます。
```python
# コメント行は、#で開始します
# コメントを複数の行に分けたい場合は、
# このように、コメント行を複数連続させるとできます
# WindowsやMacでは、 COMMAND-ENTERで1行のコマンド実行ができます
#############################################################################
# プログラミングがわからなくとも使えるコマンド類
#############################################################################
# この節では、プログラミングがわからなくとも使える便利なRコマンドを紹介します
# 全てを理解できなくとも、まずはやってみましょう！
data() # 既にロードされているデータを閲覧します
data(rivers) # "北米にある大きな川の長さ"データを取得します
ls() # "rivers" がワークスペースに表示されました
head(rivers) # データの先頭部分です
# 735 320 325 392 524 450
length(rivers) # 何本の川がデータにある?
# 141
summary(rivers) # 統計的に要約するとどうなる?
# Min. 1st Qu. Median Mean 3rd Qu. Max.
# 135.0 310.0 425.0 591.2 680.0 3710.0
# 茎葉図（ヒストグラムに似た図）を描く
stem(rivers)
# The decimal point is 2 digit(s) to the right of the |
#
# 0 | 4
# 2 | 011223334555566667778888899900001111223333344455555666688888999
# 4 | 111222333445566779001233344567
# 6 | 000112233578012234468
# 8 | 045790018
# 10 | 04507
# 12 | 1471
# 14 | 56
# 16 | 7
# 18 | 9
# 20 |
# 22 | 25
# 24 | 3
# 26 |
# 28 |
# 30 |
# 32 |
# 34 |
# 36 | 1
stem(log(rivers)) # このデータは、正規分布でも対数正規分布でもないので注意！
# 特に正規分布原理主義のみなさん
# The decimal point is 1 digit(s) to the left of the |
#
# 48 | 1
# 50 |
# 52 | 15578
# 54 | 44571222466689
# 56 | 023334677000124455789
# 58 | 00122366666999933445777
# 60 | 122445567800133459
# 62 | 112666799035
# 64 | 00011334581257889
# 66 | 003683579
# 68 | 0019156
# 70 | 079357
# 72 | 89
# 74 | 84
# 76 | 56
# 78 | 4
# 80 |
# 82 | 2
# ヒストグラム作成
hist(rivers, col="#333333", border="white", breaks=25) # これらのパラメータをつかいます
hist(log(rivers), col="#333333", border="white", breaks=25) # いろいろな使い方ができます
# 別のロード済データでやってみましょう。Rには、いろいろなデータがロードされています。
data(discoveries)
plot(discoveries, col="#333333", lwd=3, xlab="Year",
main="Number of important discoveries per year")
plot(discoveries, col="#333333", lwd=3, type = "h", xlab="Year",
main="Number of important discoveries per year")
# 年次のソートだけではなく、
# 標準的な並べ替えもできます
sort(discoveries)
# [1] 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 2 2 2 2
# [26] 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 3 3 3
# [51] 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4
# [76] 4 4 4 4 5 5 5 5 5 5 5 6 6 6 6 6 6 7 7 7 7 8 9 10 12
stem(discoveries, scale=2)
#
# The decimal point is at the |
#
# 0 | 000000000
# 1 | 000000000000
# 2 | 00000000000000000000000000
# 3 | 00000000000000000000
# 4 | 000000000000
# 5 | 0000000
# 6 | 000000
# 7 | 0000
# 8 | 0
# 9 | 0
# 10 | 0
# 11 |
# 12 | 0
max(discoveries)
# 12
summary(discoveries)
# Min. 1st Qu. Median Mean 3rd Qu. Max.
# 0.0 2.0 3.0 3.1 4.0 12.0
# サイコロを振ります
round(runif(7, min=.5, max=6.5))
# 1 4 6 1 4 6 4
# 私と同じrandom.seed(31337)を使わない限りは、別の値になります
# ガウス分布を9回生成します
rnorm(9)
# [1] 0.07528471 1.03499859 1.34809556 -0.82356087 0.61638975 -1.88757271
# [7] -0.59975593 0.57629164 1.08455362
##################################################
# データ型と基本計算
##################################################
# ここからは、プログラミングをつかうチュートリアルです
# この節ではRで重要なデータ型の、整数型、数字型、文字型、論理型と因子型をつかいます
# 他にもいろいろありますが、まずは最小限必要な、これらから始めましょう
# 整数型
# 整数型の長さは、Lで指定します
5L # 5
class(5L) # "integer"
# (?class を実行すると、class()関数についてさらなる情報が得られます)
# Rでは、この5Lのような単一の値は、長さ1のベクトルとして扱われます
length(5L) # 1
# 整数型のベクトルはこのようにつくります
c(4L, 5L, 8L, 3L) # 4 5 8 3
length(c(4L, 5L, 8L, 3L)) # 4
class(c(4L, 5L, 8L, 3L)) # "integer"
# 数字型
# 倍精度浮動小数点数です
5 # 5
class(5) # "numeric"
# くどいですが、すべてはベクトルです
# 1つ以上の要素がある数字のベクトルも、作ることができます
c(3,3,3,2,2,1) # 3 3 3 2 2 1
# 指数表記もできます
5e4 # 50000
6.02e23 # アボガドロ数
1.6e-35 # プランク長
# 無限大、無限小もつかえます
class(Inf) # "numeric"
class(-Inf) # "numeric"
# 例のように、"Inf"を使ってください。integrate( dnorm(x), 3, Inf);
# Z-スコア表が必要なくなります
# 基本的な計算
# 数を計算できます
# 整数と整数以外の数字を両方使った計算をすると、結果は整数以外の数字になります
10L + 66L # 76 # 整数足す整数は整数
53.2 - 4 # 49.2 # 整数引く数字は数字
2.0 * 2L # 4 # 数字かける整数は数字
3L / 4 # 0.75 # 整数割る数字は数字
3 %% 2 # 1 # 二つの数字を割った余りは数字
# 不正な計算は "not-a-number"になる
0 / 0 # NaN
class(NaN) # "numeric"
# You can do arithmetic on two vectors with length greater than 1,
# so long as the larger vector's length is an integer multiple of the smaller
c(1,2,3) + c(1,2,3) # 2 4 6
# CHARACTERS
# There's no difference between strings and characters in R
"Horatio" # "Horatio"
class("Horatio") # "character"
class('H') # "character"
# Those were both character vectors of length 1
# Here is a longer one:
c('alef', 'bet', 'gimmel', 'dalet', 'he')
# =>
# "alef" "bet" "gimmel" "dalet" "he"
length(c("Call","me","Ishmael")) # 3
# You can do regex operations on character vectors:
substr("Fortuna multis dat nimis, nulli satis.", 9, 15) # "multis "
gsub('u', 'ø', "Fortuna multis dat nimis, nulli satis.") # "Fortøna møltis dat nimis, nølli satis."
# R has several built-in character vectors:
letters
# =>
# [1] "a" "b" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m" "n" "o" "p" "q" "r" "s"
# [20] "t" "u" "v" "w" "x" "y" "z"
month.abb # "Jan" "Feb" "Mar" "Apr" "May" "Jun" "Jul" "Aug" "Sep" "Oct" "Nov" "Dec"
# LOGICALS
# In R, a "logical" is a boolean
class(TRUE) # "logical"
class(FALSE) # "logical"
# Their behavior is normal
TRUE == TRUE # TRUE
TRUE == FALSE # FALSE
FALSE != FALSE # FALSE
FALSE != TRUE # TRUE
# Missing data (NA) is logical, too
class(NA) # "logical"
# Here we get a logical vector with many elements:
c('Z', 'o', 'r', 'r', 'o') == "Zorro" # FALSE FALSE FALSE FALSE FALSE
c('Z', 'o', 'r', 'r', 'o') == "Z" # TRUE FALSE FALSE FALSE FALSE
# FACTORS
# The factor class is for categorical data
# Factors can be ordered (like childrens' grade levels) or unordered (like gender)
factor(c("female", "female", "male", "NA", "female"))
# female female male NA female
# Levels: female male NA
# The "levels" are the values the categorical data can take
levels(factor(c("male", "male", "female", "NA", "female"))) # "female" "male" "NA"
# If a factor vector has length 1, its levels will have length 1, too
length(factor("male")) # 1
length(levels(factor("male"))) # 1
# Factors are commonly seen in data frames, a data structure we will cover later
data(infert) # "Infertility after Spontaneous and Induced Abortion"
levels(infert$education) # "0-5yrs" "6-11yrs" "12+ yrs"
# NULL
# "NULL" is a weird one; use it to "blank out" a vector
class(NULL) # NULL
parakeet
# =>
# [1] "beak" "feathers" "wings" "eyes"
parakeet <- NULL
parakeet
# =>
# NULL
# TYPE COERCION
# Type-coercion is when you force a value to take on a different type
as.character(c(6, 8)) # "6" "8"
as.logical(c(1,0,1,1)) # TRUE FALSE TRUE TRUE
# If you put elements of different types into a vector, weird coercions happen:
c(TRUE, 4) # 1 4
c("dog", TRUE, 4) # "dog" "TRUE" "4"
as.numeric("Bilbo")
# =>
# [1] NA
# Warning message:
# NAs introduced by coercion
# Also note: those were just the basic data types
# There are many more data types, such as for dates, time series, etc.
##################################################
# Variables, loops, if/else
##################################################
# A variable is like a box you store a value in for later use.
# We call this "assigning" the value to the variable.
# Having variables lets us write loops, functions, and if/else statements
# VARIABLES
# Lots of way to assign stuff:
x = 5 # this is possible
y <- "1" # this is preferred
TRUE -> z # this works but is weird
# LOOPS
# We've got for loops
for (i in 1:4) {
print(i)
}
# We've got while loops
a <- 10
while (a > 4) {
cat(a, "...", sep = "")
a <- a - 1
}
# Keep in mind that for and while loops run slowly in R
# Operations on entire vectors (i.e. a whole row, a whole column)
# or apply()-type functions (we'll discuss later) are preferred
# IF/ELSE
# Again, pretty standard
if (4 > 3) {
print("4 is greater than 3")
} else {
print("4 is not greater than 3")
}
# =>
# [1] "4 is greater than 3"
# FUNCTIONS
# Defined like so:
jiggle <- function(x) {
x = x + rnorm(1, sd=.1) #add in a bit of (controlled) noise
return(x)
}
# Called like any other R function:
jiggle(5) # 5±ε. After set.seed(2716057), jiggle(5)==5.005043
###########################################################################
# Data structures: Vectors, matrices, data frames, and arrays
###########################################################################
# ONE-DIMENSIONAL
# Let's start from the very beginning, and with something you already know: vectors.
vec <- c(8, 9, 10, 11)
vec # 8 9 10 11
# We ask for specific elements by subsetting with square brackets
# (Note that R starts counting from 1)
vec[1] # 8
letters[18] # "r"
LETTERS[13] # "M"
month.name[9] # "September"
c(6, 8, 7, 5, 3, 0, 9)[3] # 7
# We can also search for the indices of specific components,
which(vec %% 2 == 0) # 1 3
# grab just the first or last few entries in the vector,
head(vec, 1) # 8
tail(vec, 2) # 10 11
# or figure out if a certain value is in the vector
any(vec == 10) # TRUE
# If an index "goes over" you'll get NA:
vec[6] # NA
# You can find the length of your vector with length()
length(vec) # 4
# You can perform operations on entire vectors or subsets of vectors
vec * 4 # 16 20 24 28
vec[2:3] * 5 # 25 30
any(vec[2:3] == 8) # FALSE
# and R has many built-in functions to summarize vectors
mean(vec) # 9.5
var(vec) # 1.666667
sd(vec) # 1.290994
max(vec) # 11
min(vec) # 8
sum(vec) # 38
# Some more nice built-ins:
5:15 # 5 6 7 8 9 10 11 12 13 14 15
seq(from=0, to=31337, by=1337)
# =>
# [1] 0 1337 2674 4011 5348 6685 8022 9359 10696 12033 13370 14707
# [13] 16044 17381 18718 20055 21392 22729 24066 25403 26740 28077 29414 30751
# TWO-DIMENSIONAL (ALL ONE CLASS)
# You can make a matrix out of entries all of the same type like so:
mat <- matrix(nrow = 3, ncol = 2, c(1,2,3,4,5,6))
mat
# =>
# [,1] [,2]
# [1,] 1 4
# [2,] 2 5
# [3,] 3 6
# Unlike a vector, the class of a matrix is "matrix", no matter what's in it
class(mat) # => "matrix"
# Ask for the first row
mat[1,] # 1 4
# Perform operation on the first column
3 * mat[,1] # 3 6 9
# Ask for a specific cell
mat[3,2] # 6
# Transpose the whole matrix
t(mat)
# =>
# [,1] [,2] [,3]
# [1,] 1 2 3
# [2,] 4 5 6
# Matrix multiplication
mat %*% t(mat)
# =>
# [,1] [,2] [,3]
# [1,] 17 22 27
# [2,] 22 29 36
# [3,] 27 36 45
# cbind() sticks vectors together column-wise to make a matrix
mat2 <- cbind(1:4, c("dog", "cat", "bird", "dog"))
mat2
# =>
# [,1] [,2]
# [1,] "1" "dog"
# [2,] "2" "cat"
# [3,] "3" "bird"
# [4,] "4" "dog"
class(mat2) # matrix
# Again, note what happened!
# Because matrices must contain entries all of the same class,
# everything got converted to the character class
c(class(mat2[,1]), class(mat2[,2]))
# rbind() sticks vectors together row-wise to make a matrix
mat3 <- rbind(c(1,2,4,5), c(6,7,0,4))
mat3
# =>
# [,1] [,2] [,3] [,4]
# [1,] 1 2 4 5
# [2,] 6 7 0 4
# Ah, everything of the same class. No coercions. Much better.
# TWO-DIMENSIONAL (DIFFERENT CLASSES)
# For columns of different types, use a data frame
# This data structure is so useful for statistical programming,
# a version of it was added to Python in the package "pandas".
students <- data.frame(c("Cedric","Fred","George","Cho","Draco","Ginny"),
c(3,2,2,1,0,-1),
c("H", "G", "G", "R", "S", "G"))
names(students) <- c("name", "year", "house") # name the columns
class(students) # "data.frame"
students
# =>
# name year house
# 1 Cedric 3 H
# 2 Fred 2 G
# 3 George 2 G
# 4 Cho 1 R
# 5 Draco 0 S
# 6 Ginny -1 G
class(students$year) # "numeric"
class(students[,3]) # "factor"
# find the dimensions
nrow(students) # 6
ncol(students) # 3
dim(students) # 6 3
# The data.frame() function converts character vectors to factor vectors
# by default; turn this off by setting stringsAsFactors = FALSE when
# you create the data.frame
?data.frame
# There are many twisty ways to subset data frames, all subtly unalike
students$year # 3 2 2 1 0 -1
students[,2] # 3 2 2 1 0 -1
students[,"year"] # 3 2 2 1 0 -1
# An augmented version of the data.frame structure is the data.table
# If you're working with huge or panel data, or need to merge a few data
# sets, data.table can be a good choice. Here's a whirlwind tour:
install.packages("data.table") # download the package from CRAN
require(data.table) # load it
students <- as.data.table(students)
students # note the slightly different print-out
# =>
# name year house
# 1: Cedric 3 H
# 2: Fred 2 G
# 3: George 2 G
# 4: Cho 1 R
# 5: Draco 0 S
# 6: Ginny -1 G
students[name=="Ginny"] # get rows with name == "Ginny"
# =>
# name year house
# 1: Ginny -1 G
students[year==2] # get rows with year == 2
# =>
# name year house
# 1: Fred 2 G
# 2: George 2 G
# data.table makes merging two data sets easy
# let's make another data.table to merge with students
founders <- data.table(house=c("G","H","R","S"),
founder=c("Godric","Helga","Rowena","Salazar"))
founders
# =>
# house founder
# 1: G Godric
# 2: H Helga
# 3: R Rowena
# 4: S Salazar
setkey(students, house)
setkey(founders, house)
students <- founders[students] # merge the two data sets by matching "house"
setnames(students, c("house","houseFounderName","studentName","year"))
students[,order(c("name","year","house","houseFounderName")), with=F]
# =>
# studentName year house houseFounderName
# 1: Fred 2 G Godric
# 2: George 2 G Godric
# 3: Ginny -1 G Godric
# 4: Cedric 3 H Helga
# 5: Cho 1 R Rowena
# 6: Draco 0 S Salazar
# data.table makes summary tables easy
students[,sum(year),by=house]
# =>
# house V1
# 1: G 3
# 2: H 3
# 3: R 1
# 4: S 0
# To drop a column from a data.frame or data.table,
# assign it the NULL value
students$houseFounderName <- NULL
students
# =>
# studentName year house
# 1: Fred 2 G
# 2: George 2 G
# 3: Ginny -1 G
# 4: Cedric 3 H
# 5: Cho 1 R
# 6: Draco 0 S
# Drop a row by subsetting
# Using data.table:
students[studentName != "Draco"]
# =>
# house studentName year
# 1: G Fred 2
# 2: G George 2
# 3: G Ginny -1
# 4: H Cedric 3
# 5: R Cho 1
# Using data.frame:
students <- as.data.frame(students)
students[students$house != "G",]
# =>
# house houseFounderName studentName year
# 4 H Helga Cedric 3
# 5 R Rowena Cho 1
# 6 S Salazar Draco 0
# MULTI-DIMENSIONAL (ALL ELEMENTS OF ONE TYPE)
# Arrays creates n-dimensional tables
# All elements must be of the same type
# You can make a two-dimensional table (sort of like a matrix)
array(c(c(1,2,4,5),c(8,9,3,6)), dim=c(2,4))
# =>
# [,1] [,2] [,3] [,4]
# [1,] 1 4 8 3
# [2,] 2 5 9 6
# You can use array to make three-dimensional matrices too
array(c(c(c(2,300,4),c(8,9,0)),c(c(5,60,0),c(66,7,847))), dim=c(3,2,2))
# =>
# , , 1
#
# [,1] [,2]
# [1,] 2 8
# [2,] 300 9
# [3,] 4 0
#
# , , 2
#
# [,1] [,2]
# [1,] 5 66
# [2,] 60 7
# [3,] 0 847
# LISTS (MULTI-DIMENSIONAL, POSSIBLY RAGGED, OF DIFFERENT TYPES)
# Finally, R has lists (of vectors)
list1 <- list(time = 1:40)
list1$price = c(rnorm(40,.5*list1$time,4)) # random
list1
# You can get items in the list like so
list1$time # one way
list1[["time"]] # another way
list1[[1]] # yet another way
# =>
# [1] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
# [34] 34 35 36 37 38 39 40
# You can subset list items like any other vector
list1$price[4]
# Lists are not the most efficient data structure to work with in R;
# unless you have a very good reason, you should stick to data.frames
# Lists are often returned by functions that perform linear regressions
##################################################
# The apply() family of functions
##################################################
# Remember mat?
mat
# =>
# [,1] [,2]
# [1,] 1 4
# [2,] 2 5
# [3,] 3 6
# Use apply(X, MARGIN, FUN) to apply function FUN to a matrix X
# over rows (MAR = 1) or columns (MAR = 2)
# That is, R does FUN to each row (or column) of X, much faster than a
# for or while loop would do
apply(mat, MAR = 2, jiggle)
# =>
# [,1] [,2]
# [1,] 3 15
# [2,] 7 19
# [3,] 11 23
# Other functions: ?lapply, ?sapply
# Don't feel too intimidated; everyone agrees they are rather confusing
# The plyr package aims to replace (and improve upon!) the *apply() family.
install.packages("plyr")
require(plyr)
?plyr
#########################
# Loading data
#########################
# "pets.csv" is a file on the internet
# (but it could just as easily be be a file on your own computer)
pets <- read.csv("http://learnxinyminutes.com/docs/pets.csv")
pets
head(pets, 2) # first two rows
tail(pets, 1) # last row
# To save a data frame or matrix as a .csv file
write.csv(pets, "pets2.csv") # to make a new .csv file
# set working directory with setwd(), look it up with getwd()
# Try ?read.csv and ?write.csv for more information
#########################
# Plots
#########################
# BUILT-IN PLOTTING FUNCTIONS
# Scatterplots!
plot(list1$time, list1$price, main = "fake data")
# Regressions!
linearModel <- lm(price ~ time, data = list1)
linearModel # outputs result of regression
# Plot regression line on existing plot
abline(linearModel, col = "red")
# Get a variety of nice diagnostics
plot(linearModel)
# Histograms!
hist(rpois(n = 10000, lambda = 5), col = "thistle")
# Barplots!
barplot(c(1,4,5,1,2), names.arg = c("red","blue","purple","green","yellow"))
# GGPLOT2
# But these are not even the prettiest of R's plots
# Try the ggplot2 package for more and better graphics
install.packages("ggplot2")
require(ggplot2)
?ggplot2
pp <- ggplot(students, aes(x=house))
pp + geom_histogram()
ll <- as.data.table(list1)
pp <- ggplot(ll, aes(x=time,price))
pp + geom_point()
# ggplot2 has excellent documentation (available http://docs.ggplot2.org/current/)
```
## How do I get R?
* Get R and the R GUI from [http://www.r-project.org/](http://www.r-project.org/)
* [RStudio](http://www.rstudio.com/ide/) is another GUI
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