Descriptive Statistics

Descriptive Statistics

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

• it is classified into 5 main categories including:

1. measure of central tendency
2. measure of variation or dispersion
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 measurement,
4. Data validation, and
5. Data visualization.

Measure of Central Tendency

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

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

• Mean,
• Mode,
• Medium,
• Mid-range,
• Maximum,
• Minimum, and
• Mad

Mean

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

1. Arithmetic mean,
2. Geometric mean,
3. Harmonic mean,
4. Trimmed mean
5. Weighted mean

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

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)