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In a linear cursor path, the cursor moves key by key across the keyboard.
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As shown in Fig. 11, a linear cursor path, where the cursor scans over individual keys, generally uses the shortest possible cursor duration (0.01 seconds) and assigns characters to different keys to alter the average error rate and average entry time.
On the negative side, navigating to the list of choices requires the user to guide the cursor to the list (either with a linear cursor path or in a hierarchical structure).
First, the efficiency of a linear cursor path depends on the frequency distribution of characters in the text corpus.
When coupled with a short cursor duration, the average entry time for a linear cursor path can be quite short.
A consistent outcome is that an optimized keyboard with a linear cursor path is much faster than an optimized keyboard for other cursor paths.
A linear cursor path avoids these problems by requiring only one selection.
Figure 1 shows a keyboard where the cursor follows a linear cursor path (see Additional file 1: Movie 1 for an animated version).
To ensure that all Python-related characters were part of the keyboard, the characters "{" and "}" in the original keyboard were replaced by the characters "#" and " ″". Figure 15 shows optimal keyboards using a linear cursor path for the Python text corpus.
Similarly, for a linear cursor path, there would be a single opportunity to make an error with probability 1−π k and for the binary cursor path there would be six opportunities to make errors with associated probabilities.
It is notable that the optimal solution for a linear cursor path does not always look like a very good keyboard design.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com