Add a location to your Tweets. When you tweet with a location, Twitter stores that location. You can switch location on/off before each Tweet and always have the option to delete your location history. Learn more.
Cluster sampling examples. Example 1: Assume that a study with relatively large square fixed area plots of 50 m x 50 m had been carried out, on which all tree positions were mapped. Because the individual plots were relatively large, there were only resources available to measure \(n=10\) sample plots.
It is called so because the samples are chosen at random from the clusters. In cluster random sampling, whole population is divided into groups or clusters. After that, these clusters are applied simple random sampling method in order to choose appropriate clusters as samples among them.