Sampling+Methods

__**[|Types of Probability and Non-Probability Survey Sampling Methods]**__ __**Probability Methods-**__ With probability sampling methods, each population element has a known chance of being chosen for the sample.  **Note that statistical analysis is generally based on the assumption of random samples. If the samples are not randomly chosen then statistical analysis may be invalid and give false results.  (Click on names for further details) __**Non-Probability Methods-**__ With non-probability sampling methods, we do not know the probability that each population element will be chosen, and/or we cannot be sure that each population element has a non-zero chance of being chosen.  **Non-probability sampling methods offer two potential // advantages - convenience and cost //. The main // disadvantage // is that non-probability sampling methods can allow more room for // bias // and have // lower precision //.  (Click on names for further details)
 *  **[|Simple random sampling]:**   Pure sample of population.
 *  **[|Stratified sampling:]**   Sample from separate groups.
 *  **[|Systematic sampling]**   : Use every nth person.
 *  **[|Cluster sampling]**   [|:] Focus on a few groups.
 *  **[|Convenience sampling]**  <span style="font-family: Trebuchet MS,sans-serif;"> [|:]Use who's available.
 * <span style="font-family: Trebuchet MS,sans-serif;"> **[|Purposive sampling]**  <span style="font-family: Trebuchet MS,sans-serif;"> : Selection based on purpose.
 * <span style="font-family: Trebuchet MS,sans-serif;"> **[|Modal instance sampling]**  <span style="font-family: Trebuchet MS,sans-serif;"> [|:] Focus on 'typical' people.
 * <span style="font-family: Trebuchet MS,sans-serif;"> **[|Expert sampling:]**  <span style="font-family: Trebuchet MS,sans-serif;"> Selecting 'experts' for opinion or study.
 * <span style="font-family: Trebuchet MS,sans-serif;"> **[|Quota sampling:]**  <span style="font-family: Trebuchet MS,sans-serif;"> Keep going until the sample size is reached.
 * <span style="font-family: Trebuchet MS,sans-serif;"> **[|Proportionate quota sampling:]**  <span style="font-family: Trebuchet MS,sans-serif;"> Balance across groups by population proportion.
 * <span style="font-family: Trebuchet MS,sans-serif;"> **[|Non-proportionate quota sampling]**  <span style="font-family: Trebuchet MS,sans-serif;"> [|:] Study a minimum number in each sub-group.
 * <span style="font-family: Trebuchet MS,sans-serif;"> **[|Snowball sampling]**  <span style="font-family: Trebuchet MS,sans-serif;"> [|:] Get sampled people to nominate others.
 * <span style="font-family: Trebuchet MS,sans-serif;"> **[|Diversity sampling]**  <span style="font-family: Trebuchet MS,sans-serif;"> [|:] Seeking variation with a wide net.
 * <span style="font-family: Trebuchet MS,sans-serif;"> **[|Judgment sampling]**  <span style="font-family: Trebuchet MS,sans-serif;"> [|:] Selecting what seems like a good enough sample.

<span style="font-family: Trebuchet MS,sans-serif;">**Resource-** __**[]**__