Descriptive statistics

Descriptive statistics

Descriptive statistics : is one of main branches of data analaysics . it is answering “what habppens in the data”?.

• it is classified into 5 main categories including :

1. measure of central tendancy
2. measure of variaton 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 V. Data Visualization.

Measure of central Tendance

measure of central tendance acting as the back bone of the descriptive statistics

7 main elements are the foundations of central tendance 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. trimmen mean, and
5. weighted mean

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

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)