Systematic Sampling

Systematic Random Sampling is defined as a sampling system in which the selection of the population is made on the basis of a fixed interval or pattern. This sampling method is quietly beneficial for various statisticians as it cuts down the heavily clustered population into a small manageable group. To fix the interval or the pattern is calculated by dividing the total number of the population by the desired sample size. As it cuts down the heavily clustered population, it gives a piece of reliable information, and it is easy and quick to perform. Systematic sampling is further divided into three types, namely, systematic random sampling, linear systematic sampling, and circular systematic sampling.

WHAT IS RANDOM SAMPLING?

Random sampling is defined as the sampling system on the selection system of the population of elements according to the desired size. In this selection process, every population has an equal chance in the probability of getting selected. Random sampling provides an informative database about the population which can be proved beneficial in the financial and statistical. It does not require any skilled person or knowledgeable background to do the random sampling. Moreover, it is a field where every person learns and grows along with the sampling as they get to experience during the selection process of the population. Random sampling is further divided into several groups according to the selection method.

TYPES OF RANDOM SAMPLING:

Random sampling is termed as the selection of the population, where each member of the population has an equal chance of getting selected. Random sampling is divided into four types, they are:

• Simple random sampling: simple random sampling is stamped as the selection process of the population, where each member of the population has an equal chance of getting selected. This sampling requires a sampling frame or list to store the data.
• Stratified random sampling: In stratified random sampling, the population is divided into two groups according to their attributions. The selection process is carried out among the two groups, where each group has an equal probability of getting represented.
• Cluster random sampling: In this random sampling, the population is divided into small groups called clusters, which act as the groups’ leaders. Therefore, this election is considered among the clusters of the group.
• Systematic random sampling: systematic random sampling is dubbed as the selection of the nth member of the population. This sampling system is based on rectifying the large population into a small-sized category.

Though, several situations occur where several members do not participate in the selection process, which leads to sampling bias. This sampling bias could be rectified by carrying out the selection method carefully.

SYSTEMATIC RANDOM SAMPLING:

Systematic random sampling is based on the principle of selecting the population starting from a certain point and then selecting the population on that fixed interval or the pattern. Systematic random sampling is basically carried out when the population size is large. Thus, it follows a certain rule to cut down the size into smaller groups. It is considered a random sampling because the starting point of this selection process is chosen randomly, and this selection is made in a fixed interval or pattern, or sequence. These intervals are the patterns between the population selection termed the sampling intervals. Systematic random sampling reduces the clustering of the population and maintains statistical certainty. Considering a systematic random sampling example, selecting every 50th person from the population of 50,000 will cut down the cluster of the population to 1000 people.

TYPES OF SYSTEMATIC SAMPLING:

Systematics Sampling is divided into three groups. They are:

• Systematic random sampling: this is the basic sampling category of systematic sampling. In Systematic random sampling, a random starting point is selected and after which the population is selected based on that fixed interval. It is basically used by statisticians.
• Linear systematic sampling: in a systematic linear sampling, selection of the population based on a fixed interval of the pattern. The fixed interval is determined by dividing the total population by that of the sample size. If the value obtained is not an integer, take the closest integer to that value.
• Circular Systematic sampling: in a systematic circular sampling, the section of the population is done on the basis of a fixed interval in such a manner that the sampling begins from this same point once it ends.

CONCLUSION:

Systematic sampling is one of the most reliable sampling methods used by scientists and statisticians. This systematic sampling is easy and good to perform and cut down the heavily clastic population into small groups, making it less prone to statistical uncertainties. On the basis of selection, systematic sampling is categorised into three types, i.e., systematic random sampling, linear systematic sampling, and circular systematic sampling. The fixed interval for systematic sampling is calculated by dividing the total population by the sample size. As systematic sampling is based upon the rules of probability, it is suggested to have a basic knowledge of probability.