Hsslive-Xi-2. Collection of Data
Hsslive-Xi-2. Collection of Data
Hsslive-Xi-2. Collection of Data
COLLECTION OF DATA
Study Notes
Data
Data is the plural of the term ‘datum’. It is the information collected for a
statistical surveys.
Statistical Investigation
analysis and interpretation of data. The person who conduct the investigation is called
The persons who collect data for the investigator is called enumerator.
infinite or large, we cannot study all the units in the population. In that situation the
The method of collecting data from each and every unit of the population is
called census.
Variables
The factors which can vary from one object to another are called variables.
There are two types of variables – Quantitative variables and Qualitative variables.
Quantitative variables
discrete variable and continuous variable. A discrete variable takes specified values
only. Eg:- The number of members in a family, the number of books in a library etc. A
continuous variable takes any value within a defined range of values. It can take
infinitely many values between any two values. Eg:- Height, Weight, time etc.
Qualitative variables
The data collected by the investigator directly from the population is called
techniques.
Data obtained from existing sources which may be published or unpublished are
1. Primary data is original in nature but secondary data is not original in nature.
2. Primary data is in the form of raw materials, secondary data is in the form of
finished products.
3. Primary data collection involves more money and time while less money and less
4. Trained persons are required for the collection of primary data. The
5. Primary data after use become secondary data. But secondary data cannot be
3. Direct observation.
4. Telephone interview.
informants are directed to fill up the questionnaire and return to the investigator with
the quality of the questions and the honesty of the informants. Using questionnaire is
suitable when the informants are widely scattered and they are literate.
Schedules are useful when the informants are not widely scattered or they are
approach the informants with the set of questions and collect information. The
questions used in schedules may not be detailed and self explanatory as in the case of
questionnaires.
3. The informants are to be literate for using questionnaire. The informants need
informant.
1. Government publications.
5. Reliable websites