FREQUENCY DISTRIBUTION AND GRAPHS

1.  first nurse to use graphic representational statistics 

   1. Sanitary conditions in scutari 

Florence Nightingale

• organizing raw data in table form 

Frequency Distribution:

Frequency Distribution 2 types

• Categorical frequency distribution → NOMINAL (Characteristics)

• Grouped frequency distribution → ORDINAL (ranking) 

Whats in the CATEGORICAL data table (from left to right)

1. Class

2. Tally

3. Frequency

4. Percentage

Whats in the GROUPED frequency distribution table (from left to right)

1. Class Limit

2. Class boundaries

3. Tally

4. Frequency

5. Cumulative Frequency

6. Relative Frequency %

7. Cumulative Frequency %

FORMULA for Percentage

% = f/n x 100

f- frequency value

n- total of frequencies

FORMULA for Range

• highest - lowest value 

• Round UP if merong decimal ( NOT ROUND OFF)

Sturge’s Formula (k is constant)

• #Interval = Range / (K)

  • K = 1. 3.322 log N 

  • N =   total number of observations  

  • I = size of interval 

FORMULA for Class boundaries

• Lower boundary = - 0.5 

• Upper boundary = + 0.5 

• Cumulative Frequency 

• Add from previous frequency values

• Total must be = total number of observations  

FORMULA for Relative Frequency %

F/ N x 100 

• F = frequency 

• N= total number of observations

FORMULA for Cumulative Frequency %

• Cumulative Frequency %

  • Add from previous cumulative frequency 

  • Total must be = 100% 

UNGROUPED FREQUENCY DISTRIBUTION TABLE 

• CLASS LIMIT : no range ( can be used if numbers are not scattered and if small ang total) 

  • Lowest data 

  • In between 

  • Highest data 

Reasons for Constructing  FREQUENCY DISTRIBUTION TABLE [5]