Frequency Distribution

Frequency Distribution

It is a grouping

of the data into categories showing

the number of observations in each

of the non-overlapping classes.

Raw data

It is the data gathered in original form.

Range

It is the difference of the highest value and the lowest value

in a distribution.

Class Limits (or Apparent

Limits)

It is the highest and lowest values describing a class.

Class Boundaries (or

Real Limits)

It is the upper and lower values of a class of group frequency

distribution whose values has additional decimal place more

that the class limits and end with the digit 5.

Interval (width)

It is the distance between the class lower boundary and the

class upper boundary and it is denoted by the symbol “i”.

Frequency

It is the number of values in a specific class of a frequency

distribution.

Relative Frequency

It is the value obtained when the frequencies in each class of the

frequency distribution is divided by the total number of values.

Percentage

It is obtained by multiplying the relative frequency by 100%.

Cumulative frequency

It is the sum of the frequencies accumulated up to the upper

boundary of a class in a frequency distribution.

Midpoint or Class

mark

It is the point halfway between the class limits of each class and

it is representative of the data within that class.

Categorical Frequency distribution

It is used to organized nominal-level or

ordinal-level type of data such as gender, business types, and civil status.

Grouped Frequency Distribution

It is used when the range of the data set is large and

grouping of data with several class interval.