Notes - Organisation of Data Class 11, Statistics for Economics | EduRev Notes

Statistics for Economics - Class XI

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Commerce : Notes - Organisation of Data Class 11, Statistics for Economics | EduRev Notes

The document Notes - Organisation of Data Class 11, Statistics for Economics | EduRev Notes is a part of the Commerce Course Statistics for Economics - Class XI.
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Organization of Data

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

2. 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.

3. Statistical Series: Systematic arrangement of statistical data
Notes - Organisation of Data Class 11, Statistics for Economics | EduRev Notes

I. Can be on the basis of individual units :

The data can be individually presented in two forms:

i] Raw data: Data collected in original form.

ii] Individual Series: The arrangement of raw data individually. It can be expressed in two ways.

a] Alphabetical arrangement : Alphabetical order

b] Array: Ascending or descending order.

II. Can be on the basis of Frequency Distribution:

Frequency distribution refers to a table in which observed values of a variable are classified according to their numerical magnitude.

1. Discrete Series: A variable is called discrete if the variable can take only some particular values.

2. Continuous Series: A variable is called continuous if it can take any value in a given range. In constructing continuous series we come across terms like:

a] Class : Each given internal is called a class e.g., 0-5, 5-10.

b] Class limit: There are two limits upper limit and lower limit.

c] Class interval: Difference between upper limit and lower limit.

d] Range: Difference between upper limit and lower limit.

e] Mid-point or Mid Value: Upper limit - Lower limit

2

f] Frequency: Number of items [observations] falling within a particular class.

i] Exclusive Series: Excluding the upper limit of these classes, all the items of the class are included in the class itself. E.g., :

Marks

0-10

20-Oct

20-30

30-40

Number of Students

2

5

2

1


ii] Inclusive Series: Upper class limits of classes are included in the respective classes. E.g.,

Marks

0-9

19-Oct

20-29

Number of Students

2

5

2


Open End Classes : The lower limit of the first class and upper limit of the last class are not given. E.g.,

Marks

Below 20

20-30

30-40

40-50

50 and above

Number of Students

7

6

12

5

3


iii] Cumulative Frequency Series: It is obtained by successively adding the frequencies of the values of the classes according to a certain law.

a] ‘Less than’ Cumulative Frequency Distribution :

The frequencies of each class-internal are added successively.

b] ‘More than’ Cumulative Frequency Distribution:

The more than cumulative frequency is obtained by finding the cumulative totals of frequencies starting from the highest value of the variable to the lowest value.

Marks

No. of Students

0-10

2

10-20

5

20-30

10

30-40

12

40-50

17

50-60

4



Marks

No. of Students

Less than 10

2

Less than 20

7

Less than 30

17

Less than 40

29

Less than 50

46

Less than 60

50


Marks

No. of Students

More than 0

50

More than 10

48

More than 20

43

More than 30

33

More than 40

21

More than 50

4


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