Question

Use R to calculate a new variable (called z.days) based on the existing variable "days". This variable should represent the z-scores for each observation of "days". You should therefore have a whole new column in your data set that has 500 different values. When calculating the z-scores in R, be sure to use the z-score formula from Lesson L02, a mean value of 685.25, and a standard deviation of 419.95.

Complete the blanks below with the missing syntax you would use to complete this task in R.

$  = ( $ - 685.25 ) / 419.95

Answer 1

suppose I have data set which store in 'D' name and also We have new variable / new column with name new. Which ever column we have to extract use that column name to extract.

check column name with r command

ColNames( D)

first we have to extract the new column from our data set..and command is

D$new

or

D$"new"

now we have extracted column new ..

We know that,

Formula for

Z score = ( x - mu ) / sigma

here,

mu = mean

sigma = standard deviation

#Code for R and R studio

Mu= 685.25

sigma= 419.95

Zscore= ( D$new - mu ) / sigma

Zscore