When an investigator collects data himself with a definite plan or design in his/her mind is called primary data.
Data which are not originally collected rather obtained from published or unpublished source are known as secondary data.
|
Primary Data |
|
Secondary Data |
| 1. |
Primary data are original and just take raw material for statistical method. |
1. |
Secondary data are like finished product because these have undergone once through statistical treatment. |
| 2. |
These data are collected by the investigator himself. |
2. |
Secondary data were collected and published earlier by some one. |
| 3. |
These data are collected afresh according to independent plan. |
3. |
These data already exist, i.e. can be available in report, record, etc. |
