Rstudio 1

Question 1

how to code an object called bob and make it represent 5

Answer 1

bob=5

Question 2

how to code an object called bob and make it represent hello

Answer 2

bob=”hello”

Question 3

what is an alternative to =

Answer 3

<-

Question 4

how to calculate an equation with objects

Answer 4

bob + bob = 10

Question 5

vector and how to make one called vector1

Answer 5

store of numbers/names in order, 1D, vector1= c(1, 2, 3, 4, 5) or vector1= c(1:5)

Question 6

how to multiply a vectors values to change vector

Answer 6

vector1 * 5

Question 7

to get mean/median/min/max of vector1

Answer 7

mean(vector1) etc

Question 8

to get mean/median/min/max of a category in vector1

Answer 8

mean(vector1$category) etc

Question 9

standard deviation

Answer 9

how much the data spreads from the average, sd(vector1)

Question 10

sample size

Answer 10

counts the amount of data, in a vector, length(vector1)

Question 11

dataframe

Answer 11

2D, several vectors form a dataframe

Question 12

to repeat a vector two times (for example)

Answer 12

name the repeating command, rep1 = rep(vector1, 2) so there will be 10 samples not 5

Question 13

how to get random numbers

Answer 13

make new vector, vector2 = rnorm(10, mean = 5, sd = 2), 10 sample size

Question 14

merge vectors together

Answer 14

change first vector to data frame, first name dataframe (mydata), mydata= as.data.frame(vector1, stringsAsFactors = T), then add another vector by mydata$category1 = vector1

Question 15

to get overview of dataframe/vector

Answer 15

summary(mydata$category1) or str(mydata$category1)