Organisation of data classification of data,fmj.pdf

PPT on Data

1. O
Classification of Data
The process of grouping data according
to their characteristics is known as
classification of data.

2. THOUGHT
OF THE
DAY

3. Objectives of Classification:
▶ a] To simplify complex data
▶ b] To facilitate understanding
▶ c] To facilitate comparison
▶ d] To make analysis and interpretation easy.
▶ e] To arrange and put the data according to their
common characteristics.

7. CHRONOLOGICAL CLASSIFICATION

12. Concept of Variable
▶ A characteristic or a phenomenon which is capable of being measured
and changes its value overtime is called variable.
A)Discrete Variable
Discrete variables are those variables that increase in jumps or in
complete numbers. (No fraction is possible)
Eg. Number of students in a class, Number of cars in a show room
etc. (1,2, 10,or 15 etc.)
B)Continuous Variables
Variables that assume a range of values or increase not in jumps
but continuously or in fractions are called continuous variables.
Eg. Height of the boys – 5’1’’ , 5’3’’ and so on, Marks in any range
0-10, 10-15, 15-20

13. Statistical Series
Systematic arrangement of statistical data
Raw data: Data collected in original or crude form.
Series: Arranging of raw data in different classes according
to a given order or sequence is called series.

14. Conversion of Raw Data into Series
1.Individual Series without frequency
2.Frequency series or Series with frequencies.
1] Individual Series: The arrangement of raw
data individually without
frequency

15. Individual Series can be expressed in two ways.
a] According to Serial Numbers
b] Ascending or descending order.
In ascending order, smallest number is placed first.
In descending order, the highest number is placed first.
Roll Number Marks
1 30
2 25
3 15
4 30
5 25

16. 2) Frequency Series
Two types
1.Discrete Series or Frequency Array (tally bars). No
class interval
2.Frequency Distribution (tally bars) with class
interval

17. Exclusive Series

18. Inclusive Series

19. Open Ended Classes

20. Less than frequency More than frequency
Total = 50