Classical analysis of item scores
16 important questions on Classical analysis of item scores
When you make a distribution of scores of the total sample, on a given item in which the answer mode is scaled, by which concepts can this distribution be described?
- location
- dispersion
- shape
How do we call the place on the scale where the distribution of the item scores is centered?
How do we call the scatter of the item scores in a distribution, de verdeling?
- Higher grades + faster learning
- Never study anything twice
- 100% sure, 100% understanding
For my 1st exam I got a C. Then, I started looking for ways to learn better and I came across Study Smart. Since then I have scored a A+, A, A- and another A. I highly recommend it to everyone who wants to hear it. I am so happy with it!!
I was struggling to finish all my first-year subjects for 3 years. Then I discovered Study Smart, which helped me to finish all of them within 3 months.
Because of StudySmart, things are going well in many ways. Before, I always had study stress and no time for anything. Now I feel calm and confident (because of the program). I used to score a B, now I usually score an A or A+.
Hey Chris, I really want to thank you very much for developing the platform, I usually got around C for my exams, now I scored an A+, an A and a A- !!
Since using Study Smart, my average has increased significantly. I even completed a statistics course with a A+ while I'm bad at statistics. I took on extra courses this year, because of Study Smart. Thanks so much!
Ever since I started studying with StudySmart I passed all my exams !!! No more re-sits!! At first, I was happy with a pass and now I only get good grades. Many thanks!
I aced all the courses I studied with Study Smart. For law, I first scored a D, and now an A! I’m 100% sure that I’ll pass all the courses I study with Study Smart.
I always thought I studied well. My grades were fine. I could never have imagined that applying these study skills would have such a huge and direct impact on my grades, my speed and the pleasure I have in learning.
For the first time, I finally feel totally confident about the way I learn. I have the perfect overview and make great progress in terms of speed and the grades I get. Thanks, Chris!
I immediately started to enjoy learning again, and my grades soared. All of a sudden, everything went better. I highly recommend Study Smart to all students..
Being able to create my materials online made the process of studying so much smoother and quicker. I no longer have to spend a huge amount of my time on creating my summaries.
At first, my notes were a mess. Now I use Study Smart to take my notes in a perfectly structured way. It helps me to save a lot of time and do other things I enjoy.
Students that study with Study Smart get better grades. The system applies all the learning methods in such a way that both well-performing students and students who struggle perform much better.
Hi Chris, I would like to thank you very much. Last year I scored C on a course, and this year I got an A+ thanks to your method! Thank you very much!
The largest effect is that my child is more enthusiastic about school! Every parent wants their children to be happy at school, Study Smart made it happen.
In high school, I failed several exams, and that has really changed now. I actually needed this tool very much back then. Since I started studying with StudySmart, I haven't had any D's. My average score is now an A and those are results I would have never had in the past
With my old method, I passed only 3 out of 8 courses. Since I started taking my notes digitally in Study Smart, I have passed all my courses on the first try. For me, StudySmart takes away the stress of wondering if I will pass or not.
Thanks to StudySmart, I passed all my exams, and with better grades than before! On top of that, I have mastered a very good study method now, which I am confident will help me earn my degree.
What can be determined using the location of the item score distribution?
- the classical item difficulty, in maximum performance tests, or
- the classical item attractiveness, in typical performance tests
How do you calculate the mean of a dichotomotously scored item, and how is this expressed?
- sum all the scores, divide by total sample
- p = the proportion who answered the question correct
What are the steps of item analysis?
- lower bound of the test reliability is determined
- items are rewritten or removed
- stop when a criterium is reached, For instance:
- – A certain reliability (E.g., 0.8)
- – A certain number of items (E.g., 25)
In a maximum performance test, how do we call items that a lot of test takers answer incorrect?
In a typical performance test, how do we call items that a lot of test taker respond low to?
How do we know the item difficulty/attractiveness?
When creating a test, there are two sets of guidelines, describe them.
- – General measurement instrument:
• “something for everyone”
– = you should have a proportional number of easy/difficulty
attractive/unattractive items
- – Instrument for cut-off decisions (e.g., hiring a new employee):
- • Only consider items with a difficulty/attractiveness that is relevant for the required decision
- • E.g., if selecting a manager, dont ask simple arithmatic questions
- • E.g., if selecting highly depressed subjects, dont ask too attractive questions (“I sometimes feel sad”)
What results in high test reliability?
- Large item correlations result in high reliability
- Items with larger variances contribute more to the reliability
How do we call the concept that describes How well can a given item distinguish between people that differ on the underlying construct, So: how well can a given item predict the construct?
What does it mean when items discriminate well?
When using the item-test correlation, why is the correlation biased upwards?
- because you're also correlating the item with itself, so even bad items would get some correlation.
How can you fix the fact that you're biasing upwards when using the item-test correlation?
Why are items with a high variance more useful than items with a low variance?
The question on the page originate from the summary of the following study material:
- A unique study and practice tool
- Never study anything twice again
- Get the grades you hope for
- 100% sure, 100% understanding
