Several factors contribute to incomplete information in epidemiology:
1. Underreporting: Many health events, particularly infectious diseases, may go unreported due to stigma, lack of awareness, or inadequate healthcare infrastructure. 2. Bias: Selection bias, reporting bias, and information bias can all lead to incomplete or inaccurate data. 3. Resource Limitations: Insufficient funding and resources can limit the ability to conduct comprehensive epidemiological studies. 4. Technological Constraints: Limited access to advanced data collection and analysis tools can result in incomplete datasets. 5. Data Privacy Concerns: Regulations that protect personal health information can limit the availability of data for research purposes.