Key effort charts

[Optilon]

A mixture of four different key effort charts is used for Optin in order to obtain a balanced and realistic key weighting.
1. 1980 Study: AN ANALYSIS OF THE STANDARD ENGLISH KEYBOARD

AN ANALYSIS OF THE STANDARD ENGLISH KEYBOARD.pdf

(688.05 KiB) Downloaded 1433 times

2. ADNW/KOY: by Andreas Wettstein
3. Freestyle: all fingers are free and do not have to rest on their home row position, own measurement
4. Rest position: all other fingers have to rest on their home row position while typing

1. 1980 Study: Row weight: Linear sum of weights for each row position, where the
weights given are 1, 2, and 3 for home, upper, and bottom row, respectively.
Finger weight: Linear sum of weights on each of the finger positions of the key pair, where the weights given are 4.5, 4.5, 1, 2, and 3 from the outer column inwards.

1980-Study-original.png (82.42 KiB) Viewed 25356 times

2. ADNW/KOY: slightly adapted to the ortholinear design

ADNW-original.png (75.06 KiB) Viewed 25356 times

3. Freestyle: all fingers are free and do not have to rest on their home row position, own measurement
(max strokes in 20 seconds, divided by the factor 2 for keys in home position. For all strokes apart from the strokes in the home position, the key and the associated home key had to be hit.)

Freestyle-original.png (111.33 KiB) Viewed 25356 times

Freestyle-modified.png (85.75 KiB) Viewed 25356 times

4. Rest position: all other fingers have to rest on their home row position while typing
(max strokes in 20 seconds, divided by the factor 2 for keys in home position. For all strokes apart from the strokes in the home position, the key and the associated home key had to be hit.)

Rest-position-original.png (103.51 KiB) Viewed 25356 times

Rest-position-modified.png (80.32 KiB) Viewed 25356 times

The key effort charts were normalized linearly for a total sum of 100,00.
Each chart has a weight of 25% in the calculation of the Optin effort chart.

1. 1980 Study:

1980-Study-normalized.png (74.22 KiB) Viewed 25356 times

2. ADNW/KOY:

ADNW-normalized.png (71.92 KiB) Viewed 25356 times

3. Freestyle:

Freestyle-normalized.png (86.93 KiB) Viewed 25356 times

4. Rest position:

Rest-position-normalized.png (82.69 KiB) Viewed 25356 times

Then the mean value of the four charts was calculated:

Optin-4x25%.png (94.31 KiB) Viewed 25356 times

Then the left and right values for each key were added, halved and rounded.

Optin-rounded.png (79.79 KiB) Viewed 25356 times

Libreoffice calc chart:

keyboard effor chart.ods

(23.24 KiB) Downloaded 1406 times

I exported the pictures with "export as" *.png, selection only, width 1500 px.