MDM_bias_nonresponse2

__Non-response Bias__  Non-response bias is a type of bias that can skew a survey’s results because some of the people to be questioned do not respond. The people who do not respond may have different opinions about what is being surveyed than those who do respond, making the survey results incorrect.

Some reasons for non-response are:

· occurs when the person who resides at the location are away while the questioner is trying to contact them
 * Not at Home  **

** Refusal ** · occurs when the person contacted refuses to answer. There are many reasons why, such as invasion of privacy, embarrassment, etc.

** Unable to answer ** · occurs when the person being questioned is too infirm to answer or temporarily incapacitated

** Not found ** ·  occurs when the person being questioned has moved away and left no forwarding address, are dead, or not contacted due to a survey error 

Other reasons include: not interested, forgot to complete, too busy, don’t agree with the purpose of the survey etc.

 Non-response bias leads to a more biased survey.

__**Bibliography**__

Israel, G. D. (n.d.). //PEOD9/PD008: Sampling Issues: Nonresponse//. Retrieved October 23, 2009, from [] // Response Bias //. (n.d.). Retrieved October 23, 2009, from [] // A Demonstration of the Impact of Response Bias on the Results of Patient Satisfaction Surveys //. (n.d.). Retrieved October 23, 2009, from [] // response bias - Business Definition //. (n.d.). Retrieved October 23, 2009, from [] // Nonresponse bias and early versus all responders i... [Am J Epidemiol. 1984] - PubMed result //. (n.d.). Retrieved October 23, 2009, from []


 * Allisa, Keelee, Laura**