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Oct
22
comment How to calculate user interface's efficiency time
ok I'll send the requests. Thanks!
Oct
22
revised How to calculate user interface's efficiency time
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Oct
22
comment How to calculate user interface's efficiency time
I have all this graphs built already, but does just the graph (visual) comparison gonna be enough for a valid scientific conclusion? I need a statistical value, which I call the "efficiency time" that will allow me to compare (statistically) two stimuli and conclude which one performed better.
Oct
22
comment How to calculate user interface's efficiency time
@nightting You're right 0 efficiency assumes that the task will never be done. Sorry for that. What I meant that the user is far from being really efficient on the first attempt. She needs time to get to the optimal/working efficiency. As you referenced in the image the time of completion always gets exponential over time and the part of the graph where it gets flatten hides this efficiency time which I want to obtain.
Oct
22
comment How to calculate user interface's efficiency time
I know about GOMS and FItt's law (as you noticed I referenced the Keystroke Level Modelling (KLM) which is a older brother of GOMS). The thing is it's a prediction model and what I'm looking for is a value to sumarize the obtained real life data. I don't know why but I call it the efficiency time. Maybe I'm totally wrong here. Feel free to correct me.
Oct
21
comment How to calculate user interface's efficiency time
@KenMohnkern god I wish it was that simple. I'm not a statistician also. That's why I'm seeking assistance here.
Oct
21
awarded  Editor
Oct
21
revised How to calculate user interface's efficiency time
added 892 characters in body; edited title
Oct
21
comment How to calculate user interface's efficiency time
@dan1111 It's a task designed solely for research purposes. You know this kind of academic tasks that makes no practical sense. And no in real life user will never face this task. So I guess it's not relevant.
Oct
21
comment How to calculate user interface's efficiency time
@KenMohnkern Thanks for your comments. I should have mentioned that in the question. I need to calculate the efficiency time. As you can imagine the user always starts from 0 efficiency and then through time (number of tries) efficiency increases and efficiency time decreases logarithmically reaching its final value. So I have the data for 10 tries of the same task and I need to get this value to sum up the experiment. I reckon there should be a statistical tool to calculate this value, this is what I'm looking for in fact.
Oct
21
comment How to calculate user interface's efficiency time
Thanks for your answer. I should have mentioned that in the question. I need to calculate the efficiency time. As you can imagine the user always starts from 0 efficiency and then through time (number of tries) efficiency increases and efficiency time decreases logarithmically reaching its final value. So I have the data for 10 tries of the same task and I need to get this value to sum up the experiment. I reckon there should be a statistical tool to calculate this value, this is what I'm looking for in fact.
Oct
21
asked How to calculate user interface's efficiency time
Oct
5
answered How to create my UX portfolio
Oct
3
comment UI Memorability Testing
@nightining I will research the "working memory" thing. For how long it's efficient and how to clear it out. Thanks for the idea again!!
Oct
3
comment UI Memorability Testing
@nightning thanks for your reply! The next day is the first thing I thought of but this way I need to ask participants to commit to 24 hours test and I'm sure some of them just won't show up so I was hoping maybe there's a confirmed shorter time scales. Cognitively intense task? that's really interesting! do you have any references to studies where they make these distraction tasks? and how much cognitively intense is enough? I guess it varies from case to case. Thanks.
Oct
2
awarded  Commentator
Oct
2
comment UI Memorability Testing
Basically I have 2 exactly the same stimuli with the only one variable that varies. It's not an industrial but academic study, the design won't be revised after the exposures, thus makes no relevance in my case.
Oct
2
comment UI Memorability Testing
@Izhaki the context is a simple UI - a set of buttons and images. Far from real life implementation. One of the useless UIs that academic people use for their low core research purposes.
Oct
2
comment UI Memorability Testing
@Izhaki I'm testing all 5 factors and the memorability is the only one I'm struggling with. I mean efficiency as one of the 5 factors defined by Nielsen in his "Usability Engineering".
Oct
2
comment UI Memorability Testing
@nightning define "sensible"? ))