Primary Data
- Survey data
- Experimental data (field/laboratory):
- Observational data
Methods
(i) Direct Method
(ii) Indirect Method
(iii) Questionnaire Method
(iv) Local Correspondents Method
(v) Enumeration Method
Comparison between Primary and Secondary data
| Primary Data | Secondary Data |
|---|---|
| It is collected for the first time | Compiled from already existing sources |
| It is collected directly by the investigator or by his team | Complied by persons other than the persons who collected the data |
| It costs more | It costs less |
| It requires more time | It requires considerably less time |
| Possibility of having personal bias | Personal bias is minimized |