Alshareef_ENVM510_M4GradedAssign Assignment Example | Topics and Well Written Essays - 1250 words

Alshareef_ENVM510_M4GradedAssign - Assignment ExampleDifferent types of bias that live on turn out in mistaken estimates of the word pictures effects on the risk of the disease.In epidemiological studies, researchers encounter deuce types of primary bias the selection bias and the recall bias. The selection bias arises where the relationship amongst the exposure and the disease is very different for those who participate in the subject field than for those who would be theoretical eligible for the learning but do not participate. The common consequences for the bias in selection are the difference between exposures and outcomes for those who are eligible and for those selected for the study (Yarbro, Wujcik & Gobel, 2011). For instance, in the study, the difference in the number of people avail qualified for study and those targeted is quite significant. The estimated population exposed to benzene was 9,024 but only 3,249 participants were located. According to Friis & Sellers ( 2009), illnesses and death are attainable reasons for this. This is most likely to result in inaccuracy.Recall bias results when the participants recall past exposures inaccurately. If the participants were not able to recall benzene exposures clearly, the results would be invalid. Some participants may also lie or choose to exaggerate the exposure levels for financial gain. Moreover, the methods used in collecting data may lead to inaccurate results if they had about errors. In the study, a misdiagnosis of people with leukemia or those exposed with benzene would occur. When the method of estimating the associations between leukemia and the exposure is inaccurate, the result would be either an under-estimation or over-estimation of the actual association (Yarbro, Wujcik & Gobel, 2011).According to Threats to Validity artcile (2013), The prediction of the potential sources atomic number 82 to selection bias is one way of reducing the