In stats, a sampling error is simply one that comes from looking
at a sample of the population in question and not the entire
population. That is where the name comes from. But there are other
kinds of stats errors. In contrast, non sampling error refers to
ANY other kind of error that does NOT come from looking at the
sample instead of the population. One example you may want to know
about of a non sampling error is a systematic error. OR Sampling
Error: There may be inaccuracy in the information collected during
the sample survey, this inaccuracy may be termed as Sampling error.
Sampling error = Frame error + Chance error + Response error.