During the survey process, the occurrence of bias errors are likely to occur. Some common errors that bias:
• Bias Due to Measurement Error: poverty measurement process can also lead to bias. During measurement, the bias that may arise from the question given, the status of the respondents and the influence of the environment in which the survey was conducted.
For example, the question refers to the problem concerning employees are relatives of staff or resources to create the bias shown right in question. These plans offer favors one side satisfied or dissatisfied would make respondents tend to choose the solution that question in favor of it.
Also, the surroundings also affect reliability of answers. Most people are influenced by the external environment and of itself is home. If the survey is too public and not confidential, respondents might feel afraid to answer correctly thought that instead, they will respond according to what society wants.
• Sampling Error and Survey Bias:
Each survey is for a statistical sample. If the survey repeated a survey multiple times, each time using a different form, he would have been a different statistical model. If the data in the form is not faulty statistical bias, the average of the statistics from the surveys that will give reliable parameters; vice versa if the data are different, the parameters are different and it's called the wrong number.
So, how to minimize this bias error?
First, investigators must anticipate these factors will affect the investigations / surveys to have a plan to minimize the bias error. The survey must be careful questionnaire design, using a frame accurate sample possible. After conducting the survey is finished, check again with the call or increase the sample size for the sample size increases tend to reduce sampling error.
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