Re: UKNM: Online surveys

[John McCarthy]

>We have recently placed an online survey, in a secure part of our website,

>which means limited access so only our clients can contribute.  What I'm

>interested in is that as samples go '30 being minimum true, 100 being okay

>and then 500 being optimum' - is there any info of this kind with 'online'

>samples?  Same or different?   And any stats on optimum % of respondents

>from target sample?


There is no straight forward answer to the question apart from - the more

the better.


t really depends on what you are using the survey for. If you are trying to

identify differences between different market segments then a minimum of 30

in each group is a good rule of thumb. However, if the difference you are

looking for is very small - then you will need a lot of people to identify

the difference.


The number of people is like the power of a lens. The more you have the

more detail you will be able to see.


The main issue to be aware of with any kind of sampling (online and

offline) is the population (or group of people) you are interested in. Most

online surveys are self selecting - ie. only certain types of people fill

them in and they have certain opinions. The danger is that you will not get

a representative sample of all the visitors to your site.


Hope this helps


John



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