Statistics Crash Course Day 1

Well this was the class that i took some year back, a three day R studio Tutorial classes.

- Intro To R
- How to use Rstudio
- Mean
- Median
- Mode
- Range
- Quartile Deviation
- Standard Deviation

To View the Datasets available by default

library(help="datasets")

So Basically We are using a Dataset Cars which is by default present in the RStudio which basically consists of 50 rows:

nrow(cars)
## [1] 50

and 2 columns:

ncol(cars)
## [1] 2

head() gives the first 6 rows of the dataset so that we can make an idea about the dataset

head(cars)
##   speed dist
## 1     4    2
## 2     4   10
## 3     7    4
## 4     7   22
## 5     8   16
## 6     9   10

To access a particular column

cars$speed
##  [1]  4  4  7  7  8  9 10 10 10 11 11 12 12 12 12 13 13 13 13 14 14 14 14
## [24] 15 15 15 16 16 17 17 17 18 18 18 18 19 19 19 20 20 20 20 20 22 23 24
## [47] 24 24 24 25

Similarly,

cars$dist
##  [1]   2  10   4  22  16  10  18  26  34  17  28  14  20  24  28  26  34
## [18]  34  46  26  36  60  80  20  26  54  32  40  32  40  50  42  56  76
## [35]  84  36  46  68  32  48  52  56  64  66  54  70  92  93 120  85

For mean

mean(cars$dist)                 
## [1] 42.98

Median, run :

median(cars$dist)
## [1] 36

Quantile , run :

quantile(cars$dist)
##   0%  25%  50%  75% 100% 
##    2   26   36   56  120

Variance , run :

var(cars$dist)
## [1] 664.0608

Standard Deviation , run :

sd(cars$dist)
## [1] 25.76938

To do all the things we have done at once we use a function summary()

summary(cars)
##      speed           dist       
##  Min.   : 4.0   Min.   :  2.00  
##  1st Qu.:12.0   1st Qu.: 26.00  
##  Median :15.0   Median : 36.00  
##  Mean   :15.4   Mean   : 42.98  
##  3rd Qu.:19.0   3rd Qu.: 56.00  
##  Max.   :25.0   Max.   :120.00

GRAPHS

We can also embed plots, for example:

A histogram of the speed of the Cars using hist() function

Scatterplot

plot(cars,xlab="Speed",ylab = "Distance",main = "Scatter plot of Speed and distance covered")

Barplot Similarly for barplot

barplot(cars$dist)

Note that the echo = FALSE parameter was added to the code chunk to prevent printing of the R code that generated the plot.


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