'Rsthd 2' computer keyboard layout

31 December 2017
Canonical namersthd-2.en.ergolinear
LanguageEnglish
Form factorSplit : Ergolinear
'Author'Ian Douglas
Author data may not be correct, we're working on it.
Keys horizontally staggeredNo
Letters on thumb2
Uses AltGr for standard charactersYes
Moves non-character keys (ANSI/ISO)No
Changes 'shift' pairsYes
Changes top row (ANSI/ISO)No
Uppercase on different keyNo

Click image for larger view

rsthd-2.en.ergolinear


Download the Keyboard Layout Analyzer .json file.

Rankings

MetricRankRelative %
KLA original English prose12577.38
KLA original Programming8074.87
Den 1 English prose4384.31
Den 1 Programming5983.89
Homekeys words182.71
Homeblock words1069.78
Angle mod Homeblock words979.78
Easyblock words1323.95
One-handed words2874.93
Efficiency1493.91
Homekeys bigrams1100.00
Homekeys trigrams1381.88
Homekeys quadgrams2459.51
Homekeys common words2181.40
Samefinger bigrams20 11.61
Overall ranking3355.39

Finger based metrics

Finger based metrics, as determined with Keyboard Layout Analyzer, using Patrick's original scoring model, and Den's first revised version.

We show the ranking Overall, for the broad Form Factor, and against other similar layouts (Peers), for English prose, assorted Programming, and Average of the two.

'Peers' means compared to other layouts with same characterics, e.g. ANSI/ISO vs Ergo, and matching 'Has letters on thumb', 'Uses AltGr for standard characters', 'Moves non-character keys (ANSI/ISO)', 'Changes shift pairs', 'Changes top row (ANSI/ISO)', and 'Uppercase on different key', as listed above.

 OverallOverallOverall ErgoErgoErgo PeersPeersPeers
Scoring modelEnglish proseProgrammingCombined English proseProgrammingCombined English proseProgrammingCombined
KLA original125 / 36080 / 36097 / 36093 / 10861 / 10877 / 10816 / 1615 / 1616 / 16
Den 143 / 36059 / 36044 / 36042 / 10855 / 10841 / 10813 / 1615 / 1615 / 16

English Word-based analysis

Home Keys Analysis

The Home Keys for this layout are shown with red dots in the image above, giving the following letters:

aehinorst

Home key bigrams, trigrams, quadgrams and common words

Scores are based on which fingers are used for the top 20 bigrams, trigrams and quadgrams, and top 30 common words, with the scores weighted by strength of finger used, and frequency of occurance of the text.

MetricRankWeighted scoreComponents handled and not handled
Bigrams190.17 / 90.17th he in er an re on en at ha to or it is hi es nd ou ed ng
Trigrams1332.49 / 39.68the her hat his tha ere ent ion ter ith thi tio and ing for was you ver all wit
Quadgrams249.45 / 15.88that ther tion here this thin atio with ould ight have hich whic they ever from ough were hing ment
Common words2168.74 / 84.45the to a in is that on he it as at his are this an has not or of and for was with by be from I but have they
Home Key lettersEnglish words typeableLongest wordExample
rsthenaio472318transistorisations

Word count
Word length

Easyblock Analysis

The typical Easyblock Keys for this layout form factor are shown here:
Easyblock lettersEnglish words typeableLongest wordExample
cCyYuUsStThHnNaAiIpPwWeE749116heathenishnesses

Word count
Word length

Homeblock Analysis

The typical Homeblock Keys for this layout form factor are shown here:
Homeblock lettersEnglish words typeableLongest wordExample
cCyYfFlLuUsStThHnNaAiIvVgGpPwWeE2671921intellectualistically

Word count
Word length

Angle Mod Homeblock Analysis

The typical Angle Mod Homeblock Keys for this layout form factor are shown here:
Angle mod Homeblock lettersEnglish words typeableLongest wordExample
cCyYfFlLuUsStThHnNaAiIvVgGpPwWeE2671921intellectualistically

Word count
Word length

One-handed words Analysis

This looks at how many words can be typed with only left or right hand. We want these numbers to be low.
This metric was done "strictly" ... shifted or AltGr letters were only included if Shift or AltGr was on the same hand.
Note: we exclude the Dvorak one-handed layouts comparison, since clearly by design they can type every possible word with one hand.
Left hand lettersLeft wordsLongest left wordLeft exampleRight hand lettersRight wordsLongest right wordRight exampleTotal
jcyfkrsthdvgpbe231613preceptresses zZlLuUqQmMnNaAiIoOxXwW88711nonaluminum 3203

Left handRight hand
Word count
Word lengthWord length

SameFinger Bigrams

This is a weighted analysis of same-finger usage.

The probability that a letter will follow another given letter is used to evaluate layouts by which letters pairs are on the same fingers. We multiply this figure by the percentage frequency of the first letter, in English.
We add the probabilities in both directions, for example "er" and "re".

There are some exceptions: We only look at lower case, and if the second letter is on the same key as the first, we ignore that pair.

The idea is to see how much a finger has to fly around, and if the two letters are on the same key (as in the split-case layouts) then it doesn't have to fly between them.

The metric does not measure how far the finger has to fly, just that it has to. I'll look at adding distance, row jumps, inward rolls, outward rolls, to this metric if possible.

FingerLettersScore
Left pinky'jr' 0.1139
Left ring'csv' 11.7567
Left middle'ytg' 17.1983
Left index'fkhdpb' 8.4907
Left thumb'e' 0
Right thumb'⍽' 0
Right index'zlmnxw' 23.276
Right middle'a' 0
Right ring'ui' 8.0084
Right pinky'qo' 0.1504
Both thumbs'' 0
Total 68.99

Word metric comparisons

MetricLowestLowest scorersthd-2.en.ergolinear scoreHighestHighest score
Home keysabcdef.en.ansi34723
essie-2.en.matrix174012
Easyblockqwerty-rehomed.en.ansi1007491
essie-3-wip.en.ergolinear189738
Homeblockqwerty-typewriter.en.ansi156226719
essie-3-wip.en.ergolinear273265
Angle mod Homeblockalphametric.en.ansi135426719
essie-3-wip.en.ergolinear273265
Left hand wordsqgmlwy.en.ergolinear342316
tnwmlc.en.ansi22157
Right hand wordsessie-3.en.ergolinear26887
reverse-qwerty.en.ansi14771
Total single handedessie-3.en.ergolinear1583203
tnwmlc.en.ansi22301
Average single handedessie-3.en.ergolinear791601.5
tnwmlc.en.ansi11150.5
Same finger bigramsseelpy-1.en.ergolinear8.0168.99
mcgunnigle-peoples.en.ansi1757.11

Fraser Street analysis

"Fraser Street" (thanks Shai) is a specially-crafted text in which most of the words are typed with only the left hand, on the QWERTY layout.
It was designed to highlight how much better the Dvorak layout is at hand alternation.
We ignore spaces and punctuation.

Left lettersRight lettersNeeds both hands
jcyfkrsthdvgpbezZlLuUqQmMnNaAiIoOxXwWBCDEFGHJKPRSTVY

Fraser Street was in West Everett. Westward of Fraser Street was the great vast sea. Awed, we gazed seawards, attracted by crested waves which raced and ebbed. Children were scattered on the beach edged and strewed with seaweed. They waded in water as the sea surged in and retreated. They bagged crabs as eagerly as beavers saw trees. Brave crews, seafarers in fact, steered sea craft far away. The site of Fraser Street was not overrated.

Few vegetated in Fraser Street. Nobody wasted time abed. "Acts test the breed," was ever the sacred adage. Varied crafts and trades were represented. There was a caterer, a barber, a weaver, a cabaret, and a garage. Attracted, we started to see several scenes. We were greeted as friends.

The barber catered to a varied trade, representing diverse careers and different creeds. Saturday drew the best crowd. All were seated, relaxed, aware of fewer cares, less fagged. There we saw a few starved tattered beggars who bragged of "bracers" served at cafes after a wee meal of beef stew and cabbage. A better fare was reserved for those reared on earth's greater awards.

Fraser Street summary

Left letters typed632
Right letters typed229
Needs both hands20
Total letters typed881
Switches333
Hand balance71.74 : 2.27 : 25.99

Typing lessons

Download some English words suitable for learning the layout.
Note if any files are empty it's because there are not enough words to create a lesson. This is most noticeable in the bad layouts.

Week 1Homekey words Day 1 Day 2 Day 3 Day 4 Day 5
Week 2Easyblock words Day 1 Day 2 Day 3 Day 4 Day 5
Week 3Homeblock words Day 1 Day 2 Day 3 Day 4 Day 5
Week 4Common / tricky words Day 1 Day 2 Day 3 Day 4 Day 5
Week 5Pangrams Day 1 Day 2 Day 3 Day 4 Day 5
Week 6So you think you can type? Day 1 Day 2 Day 3 Day 4 Day 5
Week 7Extra practice 1: Common words in text Day 1 Day 2 Day 3 Day 4 Day 5
Week 8Extra practice 2: Lorem ipsum and friends Day 1 Day 2 Day 3 Day 4 Day 5
Week 9Extra practice 3: Underused words Day 1 Day 2 Day 3 Day 4 Day 5