Descriptive Statistics

descriptive statistics

descriptive statistics : is one of the main branches of data analytics. it is aswering “what happen in the data”?.

• it is classifeid in to 5 main categories including:

1. measure of cenrtal tendency
2. measure of variation or dispersion
3. measture of shapes
4. measture of position, and
5. measture of frequency.

• we will cover by the following order:

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

Measure of cenrtal tendecy

Measure of central tendency acting as the back bone of the descriptive statistics.

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

mean

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

1. Arithmetic mean,
2. Geometric mean,
3. harmonic mean, and
4. trimed mean, and
5. weigthed 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)