Descriptive statistics

Descriptive statistics: is one of the main branches of data analytics. It is answering “what happens in the data?”

⁠it is classified into five main categories incuding:

⁠Measure of central tendency,
⁠Measure of variation or despersion,
⁠Measure of shapes,
⁠Measure of position, and
⁠Measure of frequency

⁠We will cover by the following order:

Data cleaning,
Data transfromation,
Data measurement,
Data validation, and
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:

mean,
mode,
median,
mid-rainge,
maximu,
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)