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When collecting data what types of bias exist?
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When collecting data there are many types of bias:

A $\textbf{voluntary response sample}$ (or $\textbf{self-selected sample}$) is one which the respondents themselves decide whether to be included.

• Internet polls, such as on Twitter, where people decided whether or not to participate.
• Call-in polls, where people are asked to call a special number to register an opinion. A \textbf{loaded question} is one that is intentionally worded to elicit a desired response.

When asked $\text{"Should the President have the line item veto to eliminate waste?"}$ 97% of respondents said $\text{"yes".}$

When asked $\text{"Should the President have the line item veto?"}$ 57% of respondents said $\text{"yes".}$

A $\textbf{nonresponse}$ occurs when someone refuses to respond or is not available.

Many telemarketers have been disguising their sales pitch as an opinion poll, causing the non-response problems to increase in recent years.

by Wooden (1,888 points)

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