+447927029939 (UK)
Statistic and psychometric data analysis for qualitative and quantitative research projects (education, health, social sciences).
ABOUT ME
I am Agustin Tristan. With over 35 years experience in Education and Engineering, I hold major portfolios of Evaluation and Certification in collaboration with Boards of Nursing, Engineering, Medicine, Teaching amongst others, across Latin America and Europe, mainly through the INSTITUTE OF EVALUATION AND ADVANCED ENGINEERING.
I have participated in revamping and standardizing professional certifications, admissions, high stakes and outcome measurement in Latin America. I have been a user and developer during the critical transformation in infrastructure and quality of the education. My engineering background combined with expertise in psychometrics, educational evaluation, numerical simulation, development of algorithms, models and software lets me provide new solutions all over the world.
A proud alumnus of École Nationale des Ponts et Chaussées in France and the Mexican National University (UNAM), I began my career teaching mathematics at the College of Engineering in the UNAM. From a young age, I have been at the forefront of international cultural activities and co-founded IEIA Foundation that provides educational support to people in need.
In addition, I invite you to read my books or papers, where you may find new approaches to solve some daily evaluation problems.
“... irresistibly contagious”
From A Christmas Carol
Charles Dickens
About the Rasch model and statistical analysis that I provide with my consultancy:
“It's a shotgun discharge”
"Es un escopetazo"
From the film: "El marido de mi novia"
"The husband of my girlfriend"
José Giaccardi and Abel Salazar
Concerning the impact I've found of the scale's validity on Cronbach's alpha, answering this question: WHAT IS THE MAXIMAL INTERNAL CONSISTENCY YOU MAY HAVE ASSUMING YOU REACH SCALE'S VALIDITY?
“That is the question”
From Hamlet
William Shakespeare
When my users ask about the convenience to use the Classical Test Theory, the Rasch model or IRT, according to a specific project.
“In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual.”
From: Dialogo dei due massimi sistemi del mundo.
Galileo Galilei
Concerning the way how I define the scale's validity from data analysis.
“The reasonable model adapts himself to the world: the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable model.”
From Man and Superman
George Bernard Shaw
About my interpretation of the Rasch paradigmatic model and the IRT descriptive model.
The experience of Dr. Tristán on psychometric assessment and statistical modelling has been very valuable for the exams that we design and apply in Mexico. He has been closely working with us since 1994, in particular he has provide the software products that we are using for test scoring and analysis. Up today, we have scored more than seven millions tests in 30 different exams. He has also participated with us in the formulation of the mathematical models suitable for assessment and item banking.
ANTONIO GAGO.
Director General. Ceneval. 2002
PUBLICATIONS
Available for Download / Disponibles pour vous
Some of the papers and recent publications or resources available to you. Please send your feedback with your comments.
Documents publiés disponibles gratuitement pour vous. Je serai content de recevoir vos commentaires.
THEORETICAL SEPARATION AND ALPHA VALUES FOR OBJECTIVE TESTS.
Tristán, L.A. (2019) Theoretical Separation and Alpha Values for Objective Tests. Rasch Measurement Transactions. Vol. 32, N.3. Summer 2019. Pp. 1725–1729.
FINDING PERSON'S THRESHOLDS IN RATING SCALE ANALYSIS USING THE RASCH MODEL.
Tristán, L.A. (2019) Finding Person's Thresholds in Rating Scale Analysis using the Rasch Model. Rasch Measurement Transactions. Vol. 32, N.2. Spring 2019. Pp 1700–1705.
EVALUATION AND ASSESSMENT IN HIGHER EDUCATION IN MEXICO.
Tristán, L.A. (2019) Evaluation and Assessment in Higher Education in Mexico. Testing International. Vol. 41, junio, pp. 18–20.
AN APPLICATION OF “COMPARISON VS. PREFERENCES”.
Tristán, L.A. & Tristan-Aldave, A. (2017) An Application of “Comparison vs. Preferences”. Rasch Measurement Transactions. Winter 2017, VOL. 31, NO. 3; ISSN 1051-0796.
USE OF THE RASCH MODEL ON NURSING TREATMENT.
Tristán, L.A., Pedraza, C.N.Y., Ariza, O.C. & Durán, V.M.M. (2017) Use of the Rasch Model on Nursing Treatment of Sleep Disorders for Cardiovascular Post-Surgery Patients. Sleep Med Dis Int J 1(5): 00025. DOI: 10.15406/smdij.2017.01.00025.
OBJECTIVITY IN STANDARDIZED TESTING (IN SPANISH).
LA OBJETIVIDAD EN LAS PRUEBAS ESTANDARIZADAS.
Tristán, L.A. y Pedraza, N. Y. (2017). La objetividad en las pruebas estandarizadas. Revista Iberoamericana de Evaluación Educativa, 10(1), pp. 11–31.
IMPLICATIONAL SCALING OF READING COMPREHENSION CONSTRUCT.
Daftarifard, P. & Tristán, L.A. (2016) Implicational scaling of reading comprehension construct: Is it deterministic or probabilistic? The Journal of Applied Linguistics. 8(18) pp. 118–142.
TAXONOMIES ON CREATIVITY (IN SPANISH).
TAXONOMÍAS SOBRE CREATIVIDAD.
Tristán, L.A. y Mendoza, G.L. (2016) Taxonomías sobre creatividad. Revista de Psicología. 34(1), pp. 147–183. ISSN 0254-9247.
INFLUENCE OF ITEM POLARITY ON OUTCOME MEASUREMENT (IN SPANISH).
INFLUENCIA DE LA DIRECCIONALIDAD DE LOS ÍTEM EN LOS RESULTADOS DE LOS INSTRUMENTOS DE MEDICIÓN.
Céspedes, C.V.M. & Tristán, L.A. (2014) Influencia de la direccionalidad de los ítem en los resultados de instrumentos de medición. Diversitas: Perspectivas en Psicología. Vol. 10. N. 1. Pp. 29–43.
CERTIFICATION OF TEACHING COMPETENCIES AT THE HIGH-SCHOOL LEVEL IN MEXICO: AN EVALUATION MODEL FOR A SOCIAL CHALLENGE.
Tristán, L.A. e Ylizaliturri, S.M.A. (2012) Certification of Teaching Competencies at the High-School Level in Mexico: An Evaluation Model for a Social Challenge. The International Journal of Educational and Psychological Assessment. 9(2) pp. 139–164.
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