All episodes of Research Methods | Dulliau Ymchwil

Mae’r animeiddiad hwn yn dangos pa mor wasgaredig yw’r data a gasglwyd a sut i ddadansoddi’r gwasgariad hwnnw. Bydd yn dangos sut y gall y gwasgariad amrywio mewn perthynas â’r cyfartaledd, drwy fesur y gwyriad safonol. Mae’r mesuriadau hyn yn ein galluogi i ddisgrifio sut y gall data amrywio o fewn poblogaeth benodedig.

Published 08/11/16

Dispersion and Standard Deviation

This animation explains what is meant by 'dispersion' and 'standard deviation' in relation to the quantitative analysis of research data.

Published 12/01/14

Research Methods | Dulliau Ymchwil

Published 09/12/10

Non-proportional Quota Sampling

Non-proportional quota sampling is used to specify the minimum number of sampled individuals that we require for each category.

Published 09/12/10

Proportional Quota Sampling

Proportional quota sampling is used to represent important characteristics of the population that might be related to a dependent variable with given characteristics, for example, gender or ethnicity.

Published 09/12/10

Snowball Sampling

This sample is selected purely at random from the sampling frame, and each element from the sampling frame has an equal chance of being selected.

Published 09/12/10

Convenience (Accidental) Sampling

Used for selecting non-probability samples. Individuals are included in the sample because they are the most easily accessible.

Published 09/12/10

Theoretical (Expert) Sampling

Used for selecting probability samples within the data gathering phase. The sampling frame displays the elements under study as a random list; selections are then made at regular intervals.

Published 09/12/10

Purposive Sampling

Used for selecting non-probability samples. This approach is useful when interested in quickly gathering the views of a specific group or groups, and is typically used in market research.

Published 09/12/10