Writing mathematical contents on digital format is more common every day. The usual method is to use WYSIWYG (What You See Is What You Get) equation editors included in mainstream text editors. However, this method requires a good deal of interaction with formula templates and the use of a pointing device. While this type of equation editors is accessible to users without visual disabilities, they present barriers for users with visual disability (UWVDs). Keyboard-based equation editors should promote not only inclusion but also an acceptable performance for sighted and non-sighted users. In this article, we analyze the efficiency of the typing protocol of the Algebra Editor, an accessible keyboard-based equation editor prototype, with sighted users. Results suggest that the protocol allows typing approximately 60 characters per minute. We also analyze the type and frequency of errors made by participants and suggest improvements to the protocol, derived from the findings. These results can be used as a reference to compare the efficiency of the protocol with non-sighted users and with other equation editors in future studies.

中文翻译：

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键入代数表达式的基于键盘的协议

每天以数字格式编写数学内容越来越普遍。通常的方法是使用主流文本编辑器中包含的WYSIWYG（所见即所得）方程式编辑器。但是，此方法需要与公式模板进行大量交互以及使用指示设备。尽管无视力障碍的用户可以使用这种方程式编辑器，但它们为有视力障碍的用户（UWVD）带来了障碍。基于键盘的方程式编辑器不仅应该提高包含度，而且还应该为有视力和无视力的用户提供可接受的性能。在本文中，我们将向有眼光的用户分析Algebra Editor（一个可访问的基于键盘的方程式编辑器原型）的键入协议的效率。结果表明该协议允许每分钟键入大约60个字符。我们还分析了参与者所犯错误的类型和发生频率，并根据研究结果提出了对协议的改进建议。这些结果可作为参考，以便在将来的研究中将协议的效率与非视线用户以及其他方程式编辑器进行比较。