+447927029939 (UK)
Statistic and psychometric data analysis for qualitative and quantitative research projects (education, health, social sciences).
FAQS
Below you will find a compilation of the most common questions I’ve been asked about my consultancy and the services I provide.
If you still have questions after reading through the FAQs, please send me an email, and I will get back to you as soon as I can.
CAN I BOOK A PRELIMINARY SESSION?
Certainly!
I shall be more than happy to discuss the principal issues of your project.
We can dedicate from 30 up to 60 minutes defining the problem, identifying your needs and looking for possible solutions.
In many cases my clients feel satisfied with this help and have a good insight of what to do. This is free for you!
In addition I can propose a complete project with activities, planning and budget, according to your context.
WHAT ARE YOU FEES?
I offer services per hour, per day or in bundle according to a set of activities.
I understand the needs and conditions of my customers, hence I can adapt my offer to your schedule and budget.
Do not hesitate to ask for a quotation. I shall be glad to provide the best service in quality, time and price.
WHAT ARE THE RASCH AND THE IRT MODELS?
Both are logistic functions establishing the probability of a correct answer that a person may produce for a given item. At the same time, the model estimate the difficulty of an item when submitted to a set of persons.
The difference is that IRT is a descriptive model with which you may estimate difficulty, discrimination and "systematic guessing" parameters of an item and test, while the Rasch model is a paradigmatic function for the difficulty of the item, allowing to identify the metric of the scale involved in the measurement, as a local objectivity property.
Do you wish to describe your data? IRT may be useful.
Do you need a measurement scale? You should use the Rasch model.
WHAT KIND OF DATA ANALYSIS CAN I REQUEST?
If you have responses from a questionnaire, a knowledge test, quizzes or surveys (in health, education or social sciences), they could be suitable for data analysis, to answer questions such as:
a) Can I define a qualitative scale from my data?
b) Is there an underlying scale with measures from "a few" to "a lot" of a certain construct or trait?
c) The items are valid or suitable for the intended purpose? How many variables are they measuring? Which items are not useful or unrelated to the variables?
d) How precise is my measure? or can I get the measurement error of my questionnaire and the items?
e) Can I provide some feedback to the judges who prepared the items and to the persons who answered the test?
f) Are there some trends in the set of responses useful for my application?