Typing

This article is about entering text. For classification of data into types in programming, see Type system.

Person typing on a notebook computer keyboard

Typing is the process of inputting text into a device, such as a typewriter, cell phone, computer, or a calculator, by pressing keys on a keyboard. It can be distinguished from other means of input, such as the use of pointing devices like the computer mouse, and text input via speech recognition.

The world's first typist was Lillian Sholes from Wisconsin. She was the daughter of Christopher Sholes, the man who invented the first practical typewriter.

User interface features such as spell checker, autocomplete and autoreplace serve to facilitate and speed up typing and to prevent or correct errors the typist may make.

Technique

Touch typing

Typing zones on a QWERTY keyboard for each finger taken from KTouch

Main article: Touch typing

The basic technique stands in contrast to hunt and peck typing as the typist keeps their eyes on the source copy at all times. Touch typing also involves the use of the home row method, where typists keep their wrists up, rather than resting them on a desk or keyboard as this can cause carpal tunnel syndrome. To avoid this, typists using this method should sit up tall leaning slightly forward from the waist, place their feet flat on the floor in front of them with one foot slightly in front of the other, keeping their elbows close to their sides with forearms slanted slightly upward to the keyboard, fingers should be curved slightly resting on the home row (asdfjkl;).

Many touch typists also use keyboard shortcuts or hotkeys when typing on a computer. This allows them to edit their document without having to take their hands off the keyboard to use a mouse. An example of a keyboard shortcut is touching the Control key plus the S key to save a copy as you type, or the Control key plus the Z key to undo a mistake. Many experienced typists can feel or sense when they've made an error and can hit the backspace key and make the correction without missing a beat.

A highly trained touch-typist on a Dvorak keyboard is the second-fastest method of English text entry available as of 2007. (The fastest text entry method involves a highly trained typist on a stenotype keyboard.)

Hunt and peck

Hunt and peck (two-fingered typing), also known as search and peck, is a common form of typing, in which the typist must find and press each key individually. This is usually slower than touch typing. Instead of relying on the memorized position of keys, the typist must find each key by sight. Use of this method may also prevent the typist from being able to see what has been typed without glancing away from the keys. Although good accuracy may be achieved, any typing errors that are made may not be noticed immediately, if at all. There is also the disadvantage that because fewer fingers are used, they are forced to move a much greater distance.

Civilian Conservation Corps typing class, 1933

There are many idiosyncratic typing styles in between "hunt and peck" and touch typing; for example, many people will type blindly, but use only two to five fingers, and not always in a systematic fashion. Some people have developed advanced forms of "peck minus hunt" that don't require looking at keys, or sacrifice of speed.

Buffering

Some people combine touch typing and hunt and peck by using a buffering method. In the buffer method, the typist looks at the source copy, mentally stores one or several sentences, then looks at the keyboard and types out the buffer of sentences. This eliminates frequent up and down motions with the head and is used in typing competitions in which the typist is not well versed in touch typing. It is not normally used in day-to-day contact with keyboards, only when time is of the essence.

Thumbing

A late 20th century trend in typing, primarily used with devices such as PDAs with thumb keyboards or smartphones with small virtual keyboards, is thumbing or thumb typing. This can be accomplished using one or both thumbs. Similar to desktop keyboards and input devices, if a user overuses keys which need hard presses and/or have small and unergonomic layouts, it could cause thumb tendonitis or other repetitive strain injury.

Words per minute

Further information: [[:Words per minute]]

Words per minute (WPM) is a measure of typing speed, commonly used in recruitment. For the purposes of WPM measurement a word is standardized to five characters or keystrokes. Therefore, "fifth" counts as one word, but "fifteenth" counts as two.

The benefits of a standardized measurement of input speed are that it enables comparison across language and hardware boundaries. The speed of an Afrikaans-speaking operator in Cape Town can be compared with a French-speaking operator in Paris.

Alphanumeric entry

In one study of average computer users, the average rate for transcription was 33 words per minute, and only 19 words per minute for composition. In the same study, when the group was divided into "fast", "moderate" and "slow" groups, the average speeds were 40wpm, 35wpm, and 23wpm respectively. "Hunt and Peck" typists can reach speeds of about 37wpm for memorized text, and 27wpm when copying text.

An average professional typist reaches 50 to 70wpm, while some positions can require 80 to 95 (usually the minimum required for dispatch positions and other typing jobs), and some advanced typists work at speeds above 120. From the 1920s through the 1970s, typing speed (along with shorthand speed) was an important secretarial qualification and typing contests were popular and often publicized by typewriter companies as promotional tools.

As of 2005, writer Barbara Blackburn was the fastest English language typist in the world, according to The Guinness Book of World Records. Using the Dvorak Simplified Keyboard, she has maintained 150 words per minute (wpm) for 50 minutes, and 170 wpm for shorter periods. She has been clocked at a peak speed of 212 wpm. Blackburn, who failed her QWERTY typing class in high school, first encountered the Dvorak keyboard in 1938, quickly learned to achieve very high speeds, and occasionally toured giving speed-typing demonstrations during her secretarial career. She appeared on The David Letterman Show and felt she was made a spectacle of. Blackburn died in April 2008.

Using a personalized interface, physicist Stephen Hawking, who suffers from amyotrophic lateral sclerosis, managed to type 15 wpm with a switch and adapted software created by Walt Woltosz. Due to a slowdown of his motor skills, his interface was upgraded with an infrared camera that detects eye blinks. Actual wpm are unknown.

Numeric entry

The numeric entry, or 10-key, speed is a measure of one's ability to manipulate a numeric keypad.

Text-entry research

Error analysis

With the introduction of computers and word-processors, there has been a change in how text-entry is performed. In the past, using a typewriter, speed was measured with a stopwatch and errors were tallied by hand. With the current technology, document preparation is more about using word-processors as a composition aid, changing the meaning of error rate and how it is measured. Research performed by R. William Soukoreff and I. Scott MacKenzie, has led to a discovery of the application of a well-known algorithm. Through the use of this algorithm and accompanying analysis technique, two statistics were used, minimum string distance error rate (MSD error rate) and keystrokes per character (KSPC). The two advantages of this technique include:

1. Participants are allowed to enter text naturally, since they may commit error and correct them.
2. The identification of errors and generation of error rate statistics is easy to automate.

Deconstructing the text input process

Through analysis of keystrokes, the keystrokes of the input stream were divided into four classes: Correct (C), and Incorrect Fixed (IF), Fixes (F), Incorrect Not Fixed (INF). These key stroke classification are broken down into the following

1. The two classes Correct and Incorrect Not Fixed comprise all of the characters in transcribed text.
2. Fixes (F) keystrokes are easy to identify, and include keystrokes such as backspace, delete, cursor movements, and modifier keys.
3. Incorrect Fixed (IF) keystrokes are found in the input stream, but not the transcribed text, and are not editing keys.

Using these classes, the Minimum String Distance Error Rate and the Key Strokes per Character statistics can both be calculated.

Minimum string distance error rate

The minimum string distance (MSD) is the number of "primitives" which is the number of insertions, deletions, or substitutions to transform one string into another. The following equation was found for the MSD Error Rate

MSD Error Rate = $(INF/(C+INF))*100\%$

Key strokes per character (KSPC)

With the minimum string distance error, errors that are corrected do not appear in the transcribed text. The following example will show you why this is an important class of errors to consider:

Presented Text: the quick brown
Input Stream: the quix<-ck brown
Transcribed Text: the quick brown

in the above example, the incorrect character ('x') was deleted with a backspace ('<-'). Since these errors to do not appear in the transcribed text, the MSD error rate is 0%. This is why there is the key strokes per character (KSPC) statistic.

KSPC = $(C+INF+IF+F)/(C+INF)$

The three shortcomings of the KSPC statistic are listed below:

1. High KSPC values can be related to either many errors which were corrected, or few errors which were not corrected, however there is no way to distinguish the two.
2. KSPC depend on the text input method, and cannot be used to meaningfully compare two different input methods, such as Qwerty-keyboard and a multi-tap input.
3. There is no obvious way to combine KSPC and MSD into an over-all error rate, even though they have an inverse relationship.

Example of MSD and KSPC

Presented Text: the quick brown
Input Stream: th quix<-ck brpown
Transcribed Text: th quick brpown

In the above example, there are three errors: an 'e' is omitted, there is an extra 'x' that is corrected, and there is an extra 'p' which was not corrected. The key strokes are mapped out below:

Input Stream: |th qui| |x| |<-| |ck br||p| |own|
C: |th qui|, |ck br|, |own| = 14 characters
F: |<-| = 1 character
IF: |x| =1 character
INF:|p| = 2 characters(since the 'e' is missing)

using these numbers the following statistics were calculated

MSD = (2 / 16)*100% = 12.5%
KSPC = (18 / 16) = 1.125

Further metrics

Using the classes described above, further metrics were defined by R. William Soukoreff and I.Scott MacKenzie:

1. Error correction efficiency refers to the ease with which the participant performed error correction.
Correction Efficiency = IF/F

2. Participant conscientiousness is the ratio of corrected errors to the total number of error, which helps distinguish perfectionists from apathetic participants.
Participant Conscientiousness = IF / (IF + INF)

3. If C represents the amount of useful information transferred, INF, IF, and F represent the proportion of bandwidth wasted.
Utilized Bandwidth = C / (C + INF + IF + F)
Wasted Bandwidth = (INF + IF + F)/ (C + INF + IF + F)

Total error rate

The classes described also provide an intuitive definition of total error rate:

Total Error Rate = ((INF + IF)/ (C + INF + IF)) * 100%
Not Corrected Error Rate = (INF/ (C + INF + IF)) * 100%
Corrected Error Rate = (IF/ (C + INF + IF)) * 100%

Since these three error rates are ratios, they are comparable between different devices, something that cannot be done with the KSPC statistic, which is device dependent.

See also

War correspondent typing his dispatch in a wood outside Arnhem, 1944

• Dvorak Simplified Keyboard
• Keyboard layout
• Muscle memory
• Colemak
• QWERTY
• Stenotype
• Touch typing
• TypingWeb
• Copy typist
• Audio typist
• Data entry clerk

External links

• Free online typing lessons
• Test your speed on keypad
• typing.pro - Learn to Type