descriptive statistics

Descriptive statistics

descriptive statistics : is one of the main branches of data analystics, is is answering ” what happens in the data”?.

• it is classified into five main categories including:

1. measure of central tendency
2. measure of variation or dispertion
3. measure of shapes
4. measure of positions, and
5. measure of frequency.

• we will cover by the following order:

1. data cleaning ,
2. data transformation,
3. data validation, and
4. data visualization.

measure of central tendency

measure of central tendency acting as the back bone of the descriptive statistics 7 of the main elements are foundations of the central tendency including:

• mean
• mode
• median
• mid-range
• maximum
• minimum, and
• mad

mean

in statistics, there are more than 7 types of mean including:

1. arithmetric mean,
2. geometric mean,
3. hermonic mean,
4. trimmed mean, and
5. weighted mean

\[x^2=x^n-\alpha+\eta-\beta\]

x<-c(11,12,11,14,13,14,16,11,17,11)
summary (x) 

##    Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
##    11.0    11.0    12.5    13.0    14.0    17.0

boxplot(x)

plot(density(x))

hist(x)