Most sampling methods are purposive in nature because we usually approach the sampling problem with a specific plan in mind. In addition to the manual analysis of the content, the same text was visualized. The sampling report summary and transition to the next. Insights from an overview of the methods literature stephen j. Firstly, the convenience sampling method employed in the current. Selection of the sample is at the convenience of the researcher biased. Pdf comparison of convenience sampling and purposive sampling. The reason for the nomenclature is apparent, and so is the downside. Purposive sampling is an informant selection tool widely used in ethnobotany table 1. Nonprobability samples are most often used in qualitative research, although quantitative studies may sometimes need to. If the cinema hall was selected on the basis that it was easier to reach then. Pdf comparison of convenience sampling and purposive. Sampling methods can be categorised into two types of sampling probability sampling in this sampling method the probability of each item in the universe to get selected for research is the same. Cluster sample a sampling method in which each unit selected is a group of persons all persons in a city block, a family, etc.
Each individual is chosen randomly and each member of the population has an equal chance of being included in the sample. The purposive sampling technique, also called judgment sampling, is the deliberate choice of an informant due to the qualities the informant possesses. Rethinking convenience sampling academy publication. This article studied and compared the two nonprobability sampling techniques namely, convenience sampling and purposive sampling. When you are asked to survey about the habit of drinking alcohol in your town, you will not go and roam all around. Convenience sampling nonrandom sampling design elements are selected for convenience sampling because theyre available or easy to find examples. Used when a sampling frame not available or too expensive, and b cost of reaching an individual element is too high. Nonprobability sampling research methods knowledge base. A convenience sample is a nonprobability sample in which the researcher uses the subjects that are nearest and available to participate in the research study. They are also usually the easiest designs to implement. Convenience sampling ease of access convenience sampling defined as a group of individuals believed to be representative of the population from which it is selected, but chosen because it is close at hand rather than being randomly selected. Simple random sampling in an ordered systematic way, e. Comparison of convenience sampling and purposive sampling.
Nonprobability sampling allows for researchers to study rare outcomes, generate hypotheses, establish prevalence, and create measures of odds and risk in patient populations. The most important distinctions among these types of sampling methods are the ones between the different types of purposive sampling approaches. For example, standing at a mall or a grocery store and asking people to answer questions would be an example of a convenience sample. A lucky draw for six hampers in a ums family day e. Disadvantages a it is a difficult and complex method of samplings. Probability sampling involves random selection, allowing you to make statistical inferences about the whole group.
To draw a probability sample, we begin by identifying the population. Convenience sampling is a method of collecting data samples from people or respondents who are easily accessible to the researcher. It is one of the reasons why researchers rely on convenience sampling, which is the most common nonprobability sampling method, because of its speed, costeffectiveness, and ease of availability of the sample. Probability sampling is any sampling scheme in which the probability of choosing each individual is the same or at least known, so it can be readjusted mathematically. The sample is referred to as representative because the characteristics of a properly drawn sample represent the parent population in all ways. Convenience sampling also known as haphazard sampling or accidental sampling is. In many cases, members are readily approachable to be a part of the sample. A research on the habits, thoughts, views, and opinions of people can help us in the betterment of the society. Check the advantages and disadvantages of convenience sampling. Population divided into different groups from which we sample randomly. Sampling methods chapter 4 sampling methods that do not ensure each member of the population has an equal chance of being selected into the study voluntary response samples studies that recruit participants through advertising newspaper, magazine, and television surveys haphazard or convenience samples. Facebook polls or questions can be mentioned as a popular example for.
It has the same advantages and disadvantages as quota sampling and it is not guided. Ch7 sampling techniques university of central arkansas. Convenience sampling also known as availability sampling is a specific type of nonprobability sampling method that relies on data collection from population members who are conveniently available to participate in study. The sampling strategy needs to be specified in advance, given that the sampling method may affect the sample size estimation. However, the pros and cons of convenience sampling presented here cant be denied that although it has some advantages, it also have disadvantages. Assessing limitations and uses of convenience samples.
In voluntary sample, viewers choose the sample, not the one who conducts survey. Sampling can be defined as the process through which individuals or sampling units are selected from the sample frame. Convenience sampling also known as availability sampling is a specific type of nonprobability sampling method that relies on data collection from population. Convenience sampling is a method of collecting samples by taking samples that. Yamane, p3 examples of nonprobability sampling used extensively in 1920s and 1930s are the judgment. Convenience sampling is a type of nonprobability sampling in which people are sampled. A qualitative sampling plan describes how many observations, interviews, focusgroup discussions or cases are needed to ensure that the findings will contribute rich data.
This technique is also referred to as accidental sampling, and is commonly used in pilot studies prior to launching a larger research project. Convenience sampling is the most common form of nonprobabilistic sampling, mostly because it is misused. Convenience sampling is the most easiest way to do that. A manual for selecting sampling techniques in research. Convenience sampling is defined as a method adopted by researchers where they collect market research data from a conveniently available pool of respondents. However, you should be fully aware of the pros and cons of convenience sampling before you conduct research. The primary goal of sampling is to get a representative sample, or a small collection of units or cases from a much larger collection or population, such that the researcher can study the smaller group and produce accurate generalizations about the larger group. Sampling, recruiting, and retaining diverse samples. Groups chosen by convenience sampling are conducive to selfselection. Every member of the population is equally likely to be selected.
A sampling plan is a formal plan specifying a sampling method, a sample size, and procedure for recruiting participants box 1. Probability representative sampling includes techniques used to select a sample that clearly represents a specific population. The method is a nonprobabilistic sampling that typically used in assuring that small groups of samples are adequately represented. Convenience sampling is a type of nonprobability sampling.
It is the most commonly used sampling technique as its incredibly prompt, uncomplicated, and economical. Convenience sampling is a type of nonprobability sampling in which people are sampled simply because they are convenient sources of data for researchers. Perhaps it depends on the type of research being conducted. Groups chosen by convenience sampling are conducive to self selection. In probability sampling, each element in the population has a known nonzero chance of being selected through the use of a random selection procedure. Advantages a it is a good representative of the population. Convenience sampling is not preferred way of sampling for effective analysis as samples are taken from specific section of the population. Chapter 3 research design, research method and population 3. Although, nonprobability sampling has a lot of limitations. Convenience sampling an overview sciencedirect topics. Hence the sample collected through this method is totally random in nature.
Convenience sample in such sampling methods, surveyor picks people who are easily available to give their inputs. This nonprobability sampling method is very similar to convenience sampling, with a slight variation. A study on purposive sampling method in research neetij rai bikash thapa chapter i. Two types of sampling method can be used to recruit participants. Simple random sampling and systematic sampling simple random sampling and systematic sampling provide the foundation for almost all of the more complex sampling designs based on probability sampling. The researcher here is ease of access to his sample population by using quota sample, his tallying will be at his convenience. For example, a surveyer chooses a cinema hall to survey movie viewers. Participants are randomly selected so that all members of the population have an equal chance of being selected in the sample, eliminating the possibility of sample selection bias. Convenience sampling and purposive sampling are nonprobability sampling techniques that a researcher uses to choose a sample of subjectsunits from a population. Accidental sampling is convenience in reading the sampling population, mostly used among marketers or newspaper researchers. Purposive sampling as a tool for informant selection.
We have all seen studies that leverage students in the computer science classes. Fulcomer3 1 walden university, 3758 surrey hill place, upper arlington, oh 43220. When random sampling is used, each element in the population has an equal chance of being selected simple random sampling or a known probability of being selected stratified random sampling. The aim of this study is to compare among the two nonrandom sampling techniques in order to know whether one technique is better or useful than the other. In probability sampling every member of the population has a known non zero probability of being included in the sample. This corresponds to a nonprobability sampling method, i. Causal effects cannot be inferred from nonprobability sampling methods because of selection and observation biases associated with convenience and purposive sampling. Is convenience in reading the sampling population, mostly used among marketers or newspaper researchers. A convenience sample is a type of nonprobability sampling method where the sample is taken from a group of people easy to contact or to reach. However, the use of the method is not adequately explained in most studies. Pdf in order to answer the research questions, it is doubtful that researcher should be able to collect data from all cases.