spremino said:It's just that I realized keyboard layout design seems such a subjective science.
I have to agree to that. But I feel there's a way to tackle this by learning typing pattern from a pool of users. Yup it takes time and dedication.
spremino said:As you have learned, modern designers think same-hand rolls win over inward-rolls a-la Dvorak.
I did not understand at all. Badly want clarification :(. What's same hand rolls? bi-directional?
spremino said:On a laptop keyboard, whose keys are flat and have short travel, same-hand rolls work good. But on a keyboard whose keys have longer travel, I have found that same-hand rolls are awkward.
Again, how is this? The travel distance is the same in both cases right? Your fingers fall on the same spots right. Or I did not get you?
spremino said:A similar issue happens regarding what the designer of Carpalx calls "stroke path". That's what I thinking about when I talked about the "static left hand" in Dvorak. Sequences like WA/AW, ES/SE, RD/DR (Qwerty), are difficult to type - less so on a laptop keyboard - yet both Colemak and your layout have them. Dvorak hasn't, and that is a big win to me. Carpalx fully optimized layouts have not stroke-path issues, but still I think are inferior to Dvorak regarding inward rolls. All the above said, I don't mind Dvorak having a little more same-finger, awkward placement of L, or worse; it's still better than the alternatives.
This is gonna be elaborate. This is the heart and soul of our talk. And i want you to assimilate this perfectly. No more room for lengthy rebuttals and explanations. I'm sorry to say this that I'm fed up of making this same point over and over and again - major advantages of non-dvorak layouts - yet you point one minor advantage Dvorak layout possess.
Now let me admit that a keyboard layout design is more than few spec's I have stated here. Acknowledging this fact, let me add that these( same finger, row jump etc) are some of the important aspects of typing that I have posted here. Of course it's the final score (or the fitness as more knowledgeable people say) that matters. Now this value is different for different evaluators based on what they feel is a better typing model. I personally feel there is just one best way, though. My point is ( as I stated in my 2nd post of this thread) I haven't designed this bearing all the awkward stroke paths (which would require a computer), but a few important ones, manually, and that a complete design might look radically different from what I could reach now which might even resemble Dvorak. But can Dvorak be better even after a full design, say for instance vis-a-vis a completed layout like Colemak? A big no. Sorry if I'm sounding harsh.
Here are few reasons why. In detail. I want a reply (if you do) precisely to the point I make and not just casual statements like "Dvorak has his reasons" "you think you can beat at his own game" etc. Otherwise this discussion is only gonna prolong. Here I go.
[tip:
1) characters I post here are located as in familiar qwerty positions.
2) when I say Colemak, I mean by it modern layouts like Colemak, MTGAP or the one I could roughly design]
1. A layout that doesn't distribute finger load uniformly in accordance with finger strength doesn't even deserve to be talked about. As a person who has devoted a bit of time into this area, I can tell you effort and speed doesn't go hand in hand "always"; and it's easier to achieve better technical specs if you can mis place a key (which won't be palpable for end user in real world). Dvorak is a layout designed for speed and effort isn't given its due. I might sound too bold to say that, but I believe it. Your middle finger is stronger than your ring finger which in turn is stronger than your pinky. A layout that doesn't maintain this distribution is not a good typing model. Period. Experiences from real world is worthless, as 98% qwerty users wouldn't have thought about alternatives. In other words, if Dvorak doesn't seem to be problematic for users, they would find it even easier on a layout that does a better job, although these minute percentage differences need not be palpable. Theory matters. Colemak is "really" better.
2. I said same finger is higher in Dvorak compared to Colemak. Now you can assess which is a more difficult stroke path - AQ/QA, SW/WS, ED/DE, HY/YH, UJ/JU, IK/KI or the one you mentioned - WA/AW, ES/SE, RD/DR ?? Former is same finger sequence on same hand, latter lot is different finger sequence on same hand. I feel both are equally difficult because of the awkward structure of our conventional keyboard and weird placement of keys. But on a smooth ergonomic design (which is what I've designed upon), latter lot is easier to stroke. Hence I would say a layout that minimizes same finger more is better than a layout which minimizes WA/AW, ES/SE, RD/DR. Hope you got it.
Here's stats as I could calculate. Different evaluators give radically different values though normailzed figures would be more or less same. And my corpus is far from perfect, so I understand the underlying problems in these values. But difference with Dvorak is too much so that it still gives an idea :)
Same finger: Colemak - 0.96%
Dvorak - 2.1 %
Workman - 2.1%
Arensito - 3.5%
MTGAP2 - 1.16%
mine - 1.3%
my Dvorak like - 1.54%
3. Home row jumping strokes are much more difficult than WA/AW, ES/SE, RD/DR on any keyboard. Compare ZQ/QZ, ZE/EZ, NY/YN, MO/OM to WA/AW, ES/SE, RD/DR. The BR/RB and BL/LB sequences in Dvorak adds to this. Your opinion? Colemak has a better percentage score than Dvorak.
Colemak - 0.5%
Dvorak - 0.78 %
Workman - 1.3%
Arensito - 0.98%
MTGAP2 - 0.63%
mine - 0.1%
my Dvorak like - 0.12%
4. More home row typing is on Colemak. It means lesser finger travel distance over all. It means lesser effort.
5. Frequently hit keys shouldn't be in awkward spots (as in mine or Colemak). That is more effort. Letter frequency has a say on effort. Digraph frequency has a say on speed. An L on top row assigned for pinky means every time you have to type a frequent letter, you have to move your pinky to hit it. That's more effort, though it won't be impeding speed. I would say Dvorak layout doesn't have the best mix of speed and effort. A better model is to first fix positions for characters based on their frequency and ease of stroking.
6. I see only my two layouts with better inward roll percentage than Dvorak though. Which is not a big factor anyway
7. What matters is outward rolls which has to be a minimum. Dvorak wins hands down.
[outward rolls are still not as important as row jump or same finger;
by inward rolls and outward rolls i mean rolls over adjacent keys]
8. Regarding your point on static typing, I feel total effort is what that matters rather than how quickly you can type with left hand. I must admit that there are not many layouts that stresses the importance of this.But I don't think this is a very serious point. Normally people are ambidextrous when typing. Anyway you can find that there's more home row typing for left hand in my two layouts compared to Dvorak, and they move only as much as Dvorak away from home row (on left).
spremino said:When I said "Talk is cheap", I wasn't dismissing constructive exchange. What I was dismissing is this attitude of saying someone - Dvorak in this case - is wrong, without providing evidence.
So what's the evidence I can be providing? Bring in a Barbara Blackburn of Colemak?? I was right from start backing my claim with the theory involved in determining a better layout..
spremino said:I'll tell it with different words, maybe it will be clearer. Do you think Dvorak could have done better had he relied on computers?
One hundred percent!! All the more when he would be relying on computers he would be designing one for computers as well :P [hint: "I" would be inside home position]. His frequency data could be much much better. He could have tried a lot more different combinations he believe can be more or less as powerful. etc. If he designed now, he would have faced the competition as well :P.. Kidding.. :)
spremino said:Show us this improved "Dvorak" layout.
IMHO, Colemak, MTGAP. Hopefully I can contribute as well.
spremino said:To this day, I haven't seen a layout better than Dvorak (according to Dvorak's priorities, which I share).
Though I can't be very sure, I would believe my Dvorak version is better. For the reasons i stated above. AW/WA, ES/SE is not as difficult as same finger (strictly on my ergonomic design where keys fall very comfortably under our natural position of drumming. Otherwise you are right here).
Similarly home row jump is more difficult than AW/WA, ES/SE on any keyboard. These two are Dvorak's own priorities. I believe these two would have come on top for him too.
I tend to believe a layout which finishes off your work traveling lesser, with a uniform distribution of load, with lesser "more difficult" parameters is a better typing model, in short.
spremino said:How can one say his layout beats Dvorak when Dvorak's only difficult stroke-path is the least difficult RD/DR (Qwerty) and his layout has that plus all others?
Hope I was clear when I said Dvorak has more serious stroke paths. Just reiterating.
spremino said:Nawfal, maybe you forgot that Dvorak took years - ten if I remember correctly - to design his layout. Now, I understand that computers can aid design, but I think it would be difficult anyway to beat Dvorak's dedication by working on your spare time.
That's a fair point. I would agree to you saying that a manual design formed after yrs of hectic dedication can be better than something formed in spare time even if it involves computers. But I believe, Shai and Michael has done their research as well.
spremino said:In fact, nobody has managed to beat Dvorak to this time.
I have to agree Dvorak scores well in certain areas. And I stated before it's possible to get such results if we are not adamant on controlling the finger load distribution. I first formed a Dvorak like layout which performed better than what i posted here, but I canceled it right there when it had more work for ring finger compared to middle. In my books Dvorak has already lost before anyone could beat owing to this concern..
spremino said:1 - Mostly inward rolls (except pinky to ring finger, where I find outward rolls to be better, at least on home row, and it seems Dvorak would have agreed with me);
2 - few difficult stroke paths;
You find outward rolls to be better? Oh my GOD. In fact ring to pinky o-rolls is the toughest of rolls I find to hit :)
Last edited by nawfal (10-Dec-2010 13:51:31)