Preview

Reliability and Validity

Good Essays
Open Document
Open Document
875 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Reliability and Validity
Reliability and Validity are important aspects of research in the human services field. Without reliability and validity researchers results would be useless. This paper will define the types of reliability and validity and give examples of each. Examples of a data collection method and data collection instruments used in human services and managerial research will be given. This paper will look into why it is important to ensure that these data collection methods and instruments are both reliable and valid.
Reliability is the consistency of your measurement, or the degree to which an instrument ensures the same way each time it is used under the same condition with the same subjects. In short, it is the repeatability of a measurement. A measure is considered reliable if a person's score on the same test given twice is similar (American Educational Research Association, American psychological Association & National Council on Measurement in Education, 1999).
It is important to remember that reliability is not measured, it is estimated. For example, on a reliable test, a student would be expecting to receive the same grade regardless of when the student completed the assessment or test, when the answer was scored and graded, and who scored the response. On an unreliable examination, a student's grade or score may be different based on factors that are not related to the purpose of the test or survey. There are two ways that reliability is estimated, test/retest and internal consistency. The first implements the measurement of an instrument at two separate times for each subject. The second documents the correlation between the two separate measurements and the third assumes there is no change in the underlying condition of the survey, questionnaire or test.

Validity is one of these criteria. In the most general terms, it shows how well the measure or design does what it purports to do. The measure in question might be a psychological test of some kind, a

You May Also Find These Documents Helpful

  • Satisfactory Essays

    Validity is the extent to which a test measures what we actually wish to measure.…

    • 529 Words
    • 5 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Case 11.4

    • 503 Words
    • 3 Pages

    “Validity is the extent to which a test measures what we actually wish to measure” (Cooper and Schindler, 2014, p.257). “Reliability has to do with the accuracy and precision of a measurement procedure” (Cooper and Schindler, 2014, p. 257). Validity is more critical to measurement than reliability because without validity, reliability is meaningless. For example, a bathroom scale may give a weight each time a person weighs themselves, which proves the scale is reliable in giving feedback. If the scale displays an incorrect weight each time then it is not a valid weight and a person cannot accurately measure themselves to know if a goal is being met or not. Validity and reliability can also be thought of in terms of a person and their work. A person may show up to work on time and complete all tasks that are required everyday, which proves they are reliable, however if they tasks are not completed correctly then there is no validity to work and it must be redone. Finally, validity…

    • 503 Words
    • 3 Pages
    Satisfactory Essays
  • Good Essays

    Reliability can be explained as the consistency of scores over time. Assessments are usually reliable when you get the same results regardless of when the assessment is taken or who does the scoring. On the other hand, Validity indicates how well an assessment actually measures what it is supposed to measure. Every assessment requires students to complete some task or activity and the validity of the task should reflect some knowledge or performance, and be consistent with current educational theory and practice. The quality of the assessment should be reliable because you would think that teachers thought carefully about the assessment before giving it to their students.…

    • 702 Words
    • 3 Pages
    Good Essays
  • Satisfactory Essays

    Galvanic Cells

    • 283 Words
    • 2 Pages

    Ensure that repetitions are done and averages are worked out. Do not include any results which seem way off. Compare results to real available…

    • 283 Words
    • 2 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Before interpreting the reliability results for the clerical test and work sample it is a good idea to first define what reliability of measurement is. A measurement is reliable to the extent that it provides a consistent set of scores to represent an attribute. In the majority of the case perfect reliability is never achieved because of the errors that the distinct types of measurement have. If we test the same time more than once, we are going to have greater reliability.…

    • 1186 Words
    • 5 Pages
    Satisfactory Essays
  • Powerful Essays

    Cash Connection

    • 2200 Words
    • 9 Pages

    The industry for short-term cash loans (payday loans) grew in the early 1990’s because of the shift in financial services marketplace. The cost structure of the market rose due to bounced checks, overdraft protection fees, and late bill payments penalties. Second the trend of regulation of payday advance service that allowed protection for consumers. To avoid such cost, payday loans were the solution for consumers.…

    • 2200 Words
    • 9 Pages
    Powerful Essays
  • Good Essays

    Ctlls Assignment 003

    • 1305 Words
    • 6 Pages

    In order to prepare effective assessments we need to think about the key concepts and principles. It starts with validity. We need to make sure learners understand what we are actually assessing or measuring. For example are we assessing learners’ writing and reading skills when it is an assessment in Maths. Assessments are only valid if it evaluates what it is actually aimed to evaluate. Reliability is another concept that is related to validity but the importance is more on the accuracy and consistency of its purpose. Would we get the same outcome if we set the assessment up at a different time and different place with the same group of learners? Reliability is mostly based on all the assessors using the same standards and marking schemes.…

    • 1305 Words
    • 6 Pages
    Good Essays
  • Good Essays

    Reliability refers to the consistency, such as questionnaires or scales to assess how fearful a person is about something. Reliability of questionnaires or scales can be measured in terms of whether the test items are consistent, which is called test-retest reliability. Another way of assessing reliability is whether two independent assessors give similar scores, which is called inter-rater reliability. Test re-test refers to how consistent results are when the specific interview/questionnaire is repeated.…

    • 518 Words
    • 3 Pages
    Good Essays
  • Good Essays

    If we are looking at the validity of something it means we are measuring what we are claiming to measure, and if we are looking at the reliability of something it means if we repeat the process over and over we should always get the same if not very similar results.…

    • 429 Words
    • 2 Pages
    Good Essays
  • Better Essays

    Values and Motives Questionnaire: The Technical Manual (n.d.). Retrieved from the Liberty COUN 521 website: Psytech International.…

    • 765 Words
    • 3 Pages
    Better Essays
  • Good Essays

    For a classification system to be meaningful and useful, it needs to be valid and reliable. Reliability refers to the consistency of a measuring instrument, such as a questionnaire or scale to assess, for example, the severity of their schizophrenic symptoms. Reliability of such questionnaires or scales can be measured in terms of whether two independent clinicians give similar diagnoses (this is known as inter-rate reliability) or whether the diagnoses are consistent over time (this is known as test-retest reliability).…

    • 888 Words
    • 4 Pages
    Good Essays
  • Good Essays

    Standardization is defined as the process by which test constructors ensure that testing procedures, instructions, and scoring are identical, or as nearly identical as possible, on every testing occasion. Standardizing a test is a very important process of administering the test to a representative sample of future test-takers in order to establish a basis for meaningful comparisons of scores. With that being said, reliability is the consistence or repeatability of a measure instrument. To establish reliability, researchers compare the consistency of test-takers’ scores on two halves of the test, alternate forms of the test, or retests on the same test. There are two types of reliability. Inter-Rater Reliability and Test-retest. Test-retest reliability is when the tester test the same people at different times but the participants should get the same results that he or she received on the previous test. The next reliability is Inter-rater and that is when multiple people are giving assessments of some kind or are the subjects of some test, then similar people should lead to the same resulting scores. It can be used to calibrate people, for example those being used as observers in an experiment. On the other hand, validity is the accuracy which a measuring instrument assesses the attribute that is designed to measure correlated with measures of school performance. In other words, validity refers to how well a test measures what it is purported to…

    • 759 Words
    • 4 Pages
    Good Essays
  • Good Essays

    Validity and reliability are the backbone of what is accepted as scientific proof by researchers. Potential challenges to reliability of a research question, data, and analyses are any significant results must be repeatable. Anyone who wanted to perform the same experiment applying the same conditions should arrive at the same result. If this is successful this reinforces the results and makes a larger population accept hypothesis. Potential challenges to validity of a research question, data, and analysis is making sure whether research actually measures what it claims to measure. If someone else who looked at the research and questions if the research really measures what it supposed to, the research results are in danger of being null and void and research findings wouldn't carry weight. Potential challenges to validity and reliability of data and analysis is making sure data is reliable in the first place before any test is applied. Any misconstrue data or oversight from beginning will leave false data entered in the statistical hypothesis test that would not produce accurate results. Challenges to validity of data, and analyses are meeting requirements of the scientific research method. Following all requirements and proper procedures when gather information, chosen right population and sample sizes, and any other requirements when using method. Accurate interpretation of data is a potential challenge to reliability of data. If the research results are not interpreted correctly this leads to a cloudy analysis because data is not appropriately examined according to research…

    • 261 Words
    • 2 Pages
    Good Essays
  • Good Essays

    Reliability: If an assessment was totally reliable assessors acting independently using the same criteria should come to the same outcome when marking a piece of work, in the interests of quality, fairness and assurance.…

    • 1705 Words
    • 7 Pages
    Good Essays
  • Good Essays

    Assessment

    • 6420 Words
    • 26 Pages

    Reliable – If the assessment was carried out by a different assessor, in a different place, the results would be consistent.…

    • 6420 Words
    • 26 Pages
    Good Essays

Related Topics