The first time to review

From here, i want to review all the basis of statistics and remind of what i learnt

 

Variable

: it means features of something or someone. 

 

Cases

: it says something or someone.

 

Here's a part what i took time a bit in order to memorize the table. And the professor said it's of essential importance to distinguish different levels of measurement. It's important types of data as a matter of data analyzing and visualizaing.

Level of measurement	difference	order	similar intervals	meaningful zero point
Nominal	O	X	X	X
Ordinal	O	O	X	X
interval	O	O	O	X
ratio	O	O	O	O

 

Nominal Data : 명목자료

Ordinal Data : 순서자료

Interval Data : 구간자료

Ratio Data : 비율자료

 

Nominal, Ordinal data : Categorical variables( These are represented by numerical values )

Interval, Ratio data : Quantitative variables( These can be distinguished in discrete and continuous variables )