Statistics >>Collection of secondary data
The published sources of secondary data are
(i) Official publications of the international organisations like the U.N.O., W.H.O, International Labour Organisations (I.L.O), World Bank etc.
(ii) Official publications of the Govt. organisations like Central Statistical Organisation (C.S.O.) National Sample Survey Organisation (N.S.S.O.), Director of Economics and Statistics etc.
(iii) Official publications of the semi-govt. Organisations and local authorities.
(iv) Publications of Universities and Research institutes.
(v) Reports of various Committees and Commissions.
(vi) Publications of various Commercial and Financial institutes.
(vii) Newspapers, Magazines and Journals etc.
Beside all these there are various unpublished sources also from where secondary data may be obtained.
Precautions in using secondary data
Secondary data should not be used blindly, and they should be used with extreme care. The following points are to be examined before using secondary data.
(i) The authority which had collected the data should be reliable and dependable.
(ii) The purpose of the enquiry under investigation should have uniformity with the original purpose for which data were collected.
(iii) The interval between the time periods when data were originally collected to the time when it is going to be used should not be much.
(iv) The definition of units in which the data were collected.
(v) There should not be a significant variation between the degree of accuracy required for the present purpose and the original data.
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