Descrptive statistics

Descriptive statistics : is one of the main branches of data analys=tics . it is answering ” what happens in the data”?.

it is classified into 5 main categories including:

measure of central tendency
measure of variation or dispersion
measure of shapes
measure of positions, and
measure of frequency.

we will cover by the following order:

Data cleaning,
Data transformation,
Data measurement,
Data validation,
Data Visualization.

measure of central tendency

measure of central tendency acting as the Back bone of the descriptive statistics.

7 main elements are the foundations of the central tendency including :

mean,
mode,
median,
mid-rang,
maximum,
minimum, and
mad

Mean

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

arithmetic mean,
Geometric mean,
Harmonic mean,
trimmed mean, and
weighted mean

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

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

##    Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
##   11.00   11.00   12.00   12.82   14.00   17.00

boxplot(x)

plot(density(x))

hist(x)