Another snippet from the book to test public opinion and my own shortcoming! All views gladly received.
The process of deciding if method is appropriate should apply equally to any data collection modality, but it is a topic more frequently discussed in the context of online research.
In markets where online research is already established this step tends to operate as a negative test. Because online research is typically faster and cheaper the question often becomes is there a reason not to use an online modality.
Possible reasons not to use online include:
• If online is slower or more expensive.
• If the stimuli can’t easily be rendered online.
• If a study is highly confidential.
• If the target sample is not online.
• If the research topic is likely to interact with the online medium.
• If there are comparability issues.
• If the study requires a random probability sample.
These reasons are expanded on below.
If online is Slower or More Expensive
Generally online modalities are cheaper and quicker than other modalities, but there are exceptions. The main exception is where a survey is very short and simple, and where the sample size is very small. For example 100 interviews, with housewives, asking 10 simple questions, might be faster and quicker via telephone. In some markets even face-to-face might be cheaper and/or quicker.
If the Stimuli can’t Easily be Rendered Online
There are a wide range of stimuli that are not suitable for online surveys, for example taste, touch, and smell. Most sensory testing still has to be conducted face-to-face. Some research organisations have, however, had substantial success with posting products and other test materials to respondents, especially to panel members.
Over time the number of things that can be rendered online has increased, although this sometimes has implications for the sorts of PCs the respondents need to have and the bandwidth available.
If a Study is Highly Confidential
There are steps that can be taken to make it harder for respondents to download and share material from the survey. However, the risk cannot be completely removed, for example somebody can always use their iPhone or similar to record what they see on the screen.
Equally, it should be kept in mind that even face-to-face interviews are not 100% secure, especially with the growth of smartphones.
If the Target Sample is not Online
Even In markets where the Internet penetration is very high (such as the Scandinavian countries where the penetration is close to 90%) there are systematic differences between those who are online and those who not. Generally, the people who are not online tend to be older, have lower incomes, and tend to be more disadvantaged in terms of features such as housing, employment, and education opportunities.
If the purpose of the research is to explore a group that tends not to be online, then the online modality will tend to be unsuitable. For example, attitudes towards the internet would not normally be a suitable topic for an online survey.
If the Research Topic is Likely to Interact with the Online Medium
Some topics are too closely associated with the internet as a medium to be researched via the internet. For example, a study of how people buy music CDs in stores is likely to distorted by the fact that people who are not online buy all of their CDs in stores, whilst people online are likely to buy some or all of the CDs online, to download music, and to compare stores with online purchases.
If there are Comparability Issues
The issue of moving a study online and possibly losing comparability is dealt elsewhere in the book, but the loss of comparability with previous studies can be a reason that a study should not be conducted online.
If a study is being run in more than one country, online may not be available in all of the markets, so there may be a decision to use a methodology that is available in all the markets. However, it should be noted that in many cases there is no suitable modality that is available across several markets. When conducting a general consumer study, online and telephone are not suitable for India, and door-to-door interviews are not suitable in Australia or the US, so compromises often have to be made, especially to minimise costs.
If the Study Requires a Random Probability Sample
Unless the whole population has internet access and the whole population can be identified then a random probability sample cannot be drawn. Examples of where these conditions are met include undergraduates at many universities (where the students all have .ac email address) and also visitors to a specific website or online service, for example eBay could sample eBay users.
Public sector work sometimes requires that random probability sampling is used as does some work designed to be used in court cases. However, even in these cases the researcher should remember that many authorities believe that if the response rates to a survey are below 70% the study does not meet the criteria for a random probability sample, even if the initial sample was OK.