Mostrando postagens com marcador Psycometrics. Mostrar todas as postagens
Mostrando postagens com marcador Psycometrics. Mostrar todas as postagens

quinta-feira, 8 de novembro de 2018

Multiple choice questions



Analysis of MCQ and distractor use in a large first year Health Faculty Foundation Program: assessing the effects of changing from five to four options

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BMC Medical Education 2018, 18:252

Abstract

Background

Multiple choice questions are commonly used in summative assessment. It is still common practice for tertiary institutions and accrediting bodies to use five-option single best answer multiple choice questions, despite a substantial body of evidence showing that multiple choice questions with only three or four options provide effective and discriminatory assessment.

Methods

In this study we investigated the distribution of distractor efficacy in exams from four large first-year undergraduate courses in chemistry and in anatomy and physiology in a Health Faculty; assessed the impact on overall student score after changing from five-option to four-option single best answer multiple choice questions; and assessed the impact of changing from five options to four options on item difficulty and discrimination.

Results

For the five-option questions analysed, 19% had four effective distractors, which is higher than previous studies, but still a minority of questions. After changing from five to four options, the overall student performance on all multiple choice questions was slightly lower in the second offering of one course, slightly higher in the second offering of another course, and similar in the second offering for two courses. For a subset of questions that were used in both offerings, there were negligible differences in item difficulty and item discrimination between offerings.

Conclusions

These results provide further evidence that five-option questions are not superior to four-option questions, with reduction to four options making little if any difference to overall performance, particularly when MCQ is used in conjunction with other assessment types (including short answer questions, and practical or laboratory assessment). Further areas of study that arise from these findings are: to investigate the reasons for resistance to changing established assessment practice within institutions and by accrediting bodies; and to analyse student perceptions of the impact of a reduced number of options in MCQ-based assessment.

segunda-feira, 3 de março de 2014

Assessment





Examining Your Multiple-Choice Questions


As Ron Berk (known for his pithy humor) observes, the multiple-choice question “holds world records in the categories of most popular, most unpopular, most used, most misused, most loved and most hated.” According to one source I read, multiple-choice questions were first used around the time of World War I to measure the abilities of new Army recruits. As class sizes have grown and the demands on teacher time expanded, they have become the favorite testing tool in higher education.



However, even those who use them often aren’t all that crazy about them and with good reason. How many problems faced by professionals come in a multiple-choice format? Answering multiple-choice questions doesn’t teach students how to formulate answers; it teaches them how to select answers. And sometimes choosing the correct answer is more a function of literary skill than content knowledge. Multiple-choice questions encourage guessing, and if the guess is correct, students get credit for something they didn’t know. Answer options contain misinformation—that’s what makes them wrong. As students read and consider all the possible answers, they are exposed to incorrect content, which some research has shown influences subsequent thinking about the topic.

Many multiple-choice questions don’t challenge students to think but rather encourage them to memorize. Test bank questions are the worst. Analysis of questions in a variety of disciplines documents that around 85% of the questions test lower-level knowledge. And I’ve already referenced in the blog and lots of other places a very rigorous analysis of test questions on biology exams. “Of the 9713 assessment items submitted … by 50 faculty teaching introductory biology, 93% were rated at Bloom’s level 1 or 2—knowledge and comprehension.” (p. 437)

Clegg and Cashin in a classic (but still very helpful) paper write, “It is true that many multiple-choice items are superficial, but that is the result of poor test craftsmanship and not an inherent limitation of the item type. A well designed multiple-choice item can test high levels of student learning.” And that’s not all multiple-choice questions can do well. They can ascertain student knowledge of a wide range of topics in a timely manner. Best of all, they are quick and easy to grade.

The problem is writing those kinds of challenging questions. It takes careful thought and creativity to write a question that requires thinking to answer, and for most teachers that equates to time. Professional test question writers like those writing items for the SAT, ACT, and GRE devote hours to creating and testing questions.

The reasons and realities that motivate using multiple-choice questions are compelling. So the question is, how do we help faculty write good ones? I’m going to follow this post with one that reviews the do’s and don’ts of writing good questions. But before that, I encourage you to take a long hard look at the multiple-choice questions on your exams. When the low level of multiple-choice test questions is discussed, most faculty quickly assert that their questions are rigorous and do challenge thinking. A number of years ago, a cross-disciplinary faculty cohort reported that a third of their questions measured complex cognitive skills. An analysis showed that only 8.5% of their questions did, with the remaining testing basic comprehension and recall. Being objective isn’t easy, but it’s necessary.

Jacobs and Chase recommend that faculty write multiple-choice questions as they go (not all at once, right before the exam). If the questions are filled with the content pertaining to them, they could be reviewed, revised, or rewritten as part of class preparation. It isn’t always necessary to re-do the whole question. Sometimes an answer option is all that needs to be replaced or revised. And there’s no need for every question to test higher order thinking skills. Most of us could use a few more, but sometimes we do need to test basic knowledge.

References:
Momsen, J. L., Long, T. M., Wyse, S. A., and Ebert-May, D. (2010) Just the facts? Introductory undergraduate biology courses focus on low-level cognitive skills. Cell Biology Education, 9 (Winter), 435-440.
Clegg, V. L, and Cashin, W. E. (1986). Improving Multiple-Choice Tests. IDEA Paper No. 16. Available for free at: www.theideacenter.org.
Jacobs, L. C. and Chase, C. I. Developing and Using Tests Effectively: A Guide for Faculty. San Francisco: Jossey-Bass, 1992.




Examining Your Multiple-Choice Questions

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As Ron Berk (known for his pithy humor) observes, the multiple-choice question “holds world records in the categories of most popular, most unpopular, most used, most misused, most loved and most hated.” According to one source I read, multiple-choice questions were first used around the time of World War I to measure the abilities of new Army recruits. As class sizes have grown and the demands on teacher time expanded, they have become the favorite testing tool in higher education.
However, even those who use them often aren’t all that crazy about them and with good reason. How many problems faced by professionals come in a multiple-choice format? Answering multiple-choice questions doesn’t teach students how to formulate answers; it teaches them how to select answers. And sometimes choosing the correct answer is more a function of literary skill than content knowledge. Multiple-choice questions encourage guessing, and if the guess is correct, students get credit for something they didn’t know. Answer options contain misinformation—that’s what makes them wrong. As students read and consider all the possible answers, they are exposed to incorrect content, which some research has shown influences subsequent thinking about the topic.
Many multiple-choice questions don’t challenge students to think but rather encourage them to memorize. Test bank questions are the worst. Analysis of questions in a variety of disciplines documents that around 85% of the questions test lower-level knowledge. And I’ve already referenced in the blog and lots of other places a very rigorous analysis of test questions on biology exams. “Of the 9713 assessment items submitted … by 50 faculty teaching introductory biology, 93% were rated at Bloom’s level 1 or 2—knowledge and comprehension.” (p. 437)
Clegg and Cashin in a classic (but still very helpful) paper write, “It is true that many multiple-choice items are superficial, but that is the result of poor test craftsmanship and not an inherent limitation of the item type. A well designed multiple-choice item can test high levels of student learning.” And that’s not all multiple-choice questions can do well. They can ascertain student knowledge of a wide range of topics in a timely manner. Best of all, they are quick and easy to grade.
The problem is writing those kinds of challenging questions. It takes careful thought and creativity to write a question that requires thinking to answer, and for most teachers that equates to time. Professional test question writers like those writing items for the SAT, ACT, and GRE devote hours to creating and testing questions.
The reasons and realities that motivate using multiple-choice questions are compelling. So the question is, how do we help faculty write good ones? I’m going to follow this post with one that reviews the do’s and don’ts of writing good questions. But before that, I encourage you to take a long hard look at the multiple-choice questions on your exams. When the low level of multiple-choice test questions is discussed, most faculty quickly assert that their questions are rigorous and do challenge thinking. A number of years ago, a cross-disciplinary faculty cohort reported that a third of their questions measured complex cognitive skills. An analysis showed that only 8.5% of their questions did, with the remaining testing basic comprehension and recall. Being objective isn’t easy, but it’s necessary.
Jacobs and Chase recommend that faculty write multiple-choice questions as they go (not all at once, right before the exam). If the questions are filled with the content pertaining to them, they could be reviewed, revised, or rewritten as part of class preparation. It isn’t always necessary to re-do the whole question. Sometimes an answer option is all that needs to be replaced or revised. And there’s no need for every question to test higher order thinking skills. Most of us could use a few more, but sometimes we do need to test basic knowledge.
References:
Momsen, J. L., Long, T. M., Wyse, S. A., and Ebert-May, D. (2010) Just the facts? Introductory undergraduate biology courses focus on low-level cognitive skills. Cell Biology Education, 9 (Winter), 435-440.
Clegg, V. L, and Cashin, W. E. (1986). Improving Multiple-Choice Tests. IDEA Paper No. 16. Available for free at: www.theideacenter.org.
Jacobs, L. C. and Chase, C. I. Developing and Using Tests Effectively: A Guide for Faculty. San Francisco: Jossey-Bass, 1992.
- See more at: http://www.facultyfocus.com/articles/teaching-professor-blog/examining-multiple-choice-questions/#sthash.KU7vZ4dg.dpuf

sexta-feira, 20 de janeiro de 2012

Avaliação de estudantes


Teoria de resposta ao item avalia habilidade e minimiza o “chute”
A teoria da resposta ao item (TRI), metodologia de avaliação usada pelo Ministério da Educação no Exame Nacional do Ensino Médio (Enem), não contabiliza apenas o número total de acertos no teste. De acordo com o método, o item é a unidade básica de análise. O desempenho em um teste pode ser explicado pela habilidade do avaliado e pelas características das questões (itens).
A TRI qualifica o item de acordo com três parâmetros:
           • Poder de discriminação, que é a capacidade de um item distinguir os          
              estudantes que têm a proficiência requisitada daqueles quem não a têm ;
           • Grau de dificuldade ;
           • Possibilidade de acerto ao acaso (chute)

Essas características permitem estimar a habilidade de um candidato avaliado e de garantir que essas habilidades, medidas a partir de um conjunto de itens, sejam comparadas com outro conjunto na mesma escala, ainda que eles não sejam os mesmos e que haja quantidades diferentes de itens usados para o cálculo.
Com a TRI, não é possível comparar o número de acertos em uma área do conhecimento com o de outra. Pela teoria, o número de questões por nível de dificuldade em cada prova e as demais características dessas questões afetam o resultado. Dessa forma, acertar 40 itens em uma área não significa, necessariamente, ter uma proficiência maior do que em outra, cujo número de acertos tenha sido 35. Além disso, por serem áreas do conhecimento distintas, não é possível fazer uma relação direta entre as escalas de proficiência.
A TRI pressupõe que um candidato com um certo nível de proficiência tende a acertar os itens de nível de dificuldade menor que o de sua proficiência e errar aqueles com nível de dificuldade maior. Ou seja, o padrão de resposta do participante é considerado no cálculo do desempenho.
Entre as vantagens metodológicas da TRI está a possibilidade de elaboração de provas diferentes para o mesmo exame. Essas provas podem ser aplicadas em qualquer período do ano com grau de dificuldade semelhante e permitem a comparabilidade no tempo.
Outra característica da TRI é não ter um limite inferior ou superior padrão entre as áreas de conhecimento. Isso significa que as proficiências dos participantes não variam entre zero e mil. Os valores máximos e mínimos de cada prova dependerão das características dos itens selecionados. No Enem, somente a prova de redação tem esses valores pré-estabelecidos, uma vez que a correção não é feita com base na TRI.
Confira a tabela com as proficiências mínimas e máximas obtidas pelos participantes em cada área do conhecimento no Enem de 2011.