Sampling error’s more dangerous friend
MAY 8, 2015
Polls rely on sampling – the basic idea being that you don’t have to ask everyone to get a rough idea of how things are going to go. This is the issue of sampling error. But, as Tim Harford points out in in this excellent article on sampling problems big data , with every sample there are two sources of unreliability. Sampling error, as I’ve mentioned, but also sampling bias. sampling error has a far more dangerous friend: sampling bias.