typing là gì

This article is about entering text. For classification of data into types in programming, see Type system. For China-related meanings, see Taiping.

Typing is the process of writing or inputting text by pressing keys on a typewriter, computer keyboard, mobile phone, or calculator. It can be distinguished from other means of text input, such as handwriting and speech recognition. Text can be in the sườn of letters, numbers and other symbols. The world's first typist was Lillian Sholes from Wisconsin in the United States,^[1][2] the daughter of Christopher Sholes, who invented the first practical typewriter.^[1]

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User interface features such as spell checker and autocomplete serve lớn facilitate and tốc độ up typing and lớn prevent or correct errors the typist may make.

Techniques[edit]

Hunt and peck[edit]

Hunt and peck (two-fingered typing) is a common sườn of typing in which the typist presses each key individually. Instead of relying on the memorized position of keys, the typist must find each key by sight. Although good accuracy may be achieved, the use of this method may also prevent the typist from being able lớn see what has been typed without glancing away from the keys, and any typing errors that are made may not be noticed immediately. Because only a few fingers are used in this technique, this also means that the fingers are forced lớn move a much greater distance.

Touch typing[edit]

In this technique, the typist keeps their eyes on the source copy at all times. cảm biến typing also involves the use of the trang chủ row method, where typists rest their wrist down, rather phàn nàn lifting up and typing (which can cause carpal tunnel syndrome^{[citation needed]}). To avoid this, typists 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, and keep their elbows close lớn their sides with forearms slanted slightly upward lớn the keyboard; fingers should be curved slightly and rest on the trang chủ row.

Many touch typists also use keyboard shortcuts when typing on a computer. This allows them lớn edit their document without having lớn take their hands off the keyboard lớn use a mouse. An example of a keyboard shortcut is pressing the Ctrl key plus the S key lớn save a document as they type, or the Ctrl key plus the Z key lớn undo a mistake. Other shortcuts are the Ctrl key plus the C lớn copy and the Ctrl key and the V key lớn paste, and the Ctrl key and the X key lớn cut. Many experienced typists can feel or sense when they have made an error and can hit the ← Backspace key and make the correction with no increase in time between keystrokes.

Hybrid[edit]

There are many idiosyncratic typing styles in between novice-style "hunt and peck" and touch typing. For example, many "hunt and peck" typists have the keyboard layout memorized and are able lớn type while focusing their gaze on the screen. Some use just two fingers, while others use 3–6 fingers. Some use their fingers very consistently, with the same finger being used lớn type the same character every time, while others vary the way they use their fingers.

One study examining 30 subjects, of varying different styles and expertise, has found minimal difference in typing tốc độ between touch typists and self-taught hybrid typists.^[3] According lớn the study, "The number of fingers does not determine typing tốc độ... People using self-taught typing strategies were found lớn be as fast as trained typists... instead of the number of fingers, there are other factors that predict typing tốc độ... fast typists... keep their hands fixed on one position, instead of moving them over the keyboard, and more consistently use the same finger lớn type a certain letter." To quote doctoral candidate Anna Feit: "We were surprised lớn observe that people who took a typing course, performed at similar average tốc độ and accuracy, as those that taught typing lớn themselves and only used 6 fingers on average."

Thumbing[edit]

A late 20th century trend in typing, primarily used with devices with small keyboards (such as PDAs and Smartphones), is thumbing or thumb typing. This can be accomplished using either only one thumb or both the thumbs, with more proficient typists reaching speeds of 100 words per minute.^[4] Similar lớn 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.^[5]

Words per minute[edit]

Words per minute (WPM) is a measure of typing tốc độ, commonly used in recruitment. For the purposes of WPM measurement a word is standardized lớn five characters or keystrokes. Therefore, "brown" counts as one word, but "mozzarella" counts as two.

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

Today, even Written Chinese can be typed very quickly using the combination of a software prediction system and by typing their sounds in Pinyin.^[6] Such prediction software even allows typing short-hand forms while producing complete characters. For example, the phrase "nǐ chī le ma" (你吃了吗) meaning "Have you eaten yet?" can be typed with just 4 strokes: "nclm".

Alphanumeric entry[edit]

In one study of average computer users, the average rate for transcription was 33 words per minute, and 19 words per minute for composition.^[7] In the same study, when the group was divided into "fast", "moderate" and "slow" groups, the average speeds were 40 wpm, 35 wpm, and 23 wpm respectively. An average professional typist reaches 50 lớn 80 wpm, while some positions can require 80 lớn 95 wpm (usually the minimum required for dispatch positions and other typing jobs), and some advanced typists work at speeds above 120 wpm.^[8][9] Two-finger typists, sometimes also referred lớn as "hunt and peck" typists, commonly reach sustained speeds of about 37 wpm for memorized text and 27 wpm when copying text, but in bursts may be able lớn reach speeds of 60 lớn 70 wpm.^[10] From the 1920s through the 1970s, typing tốc độ (along with shorthand speed) was an important secretarial qualification and typing contests were popular and often publicized by typewriter companies as promotional tools.

A less common measure of the tốc độ of a typist, CPM is used lớn identify the number of characters typed per minute. This is a common measurement for typing programs, or typing tutors, as it can give a more accurate measure of a person's typing tốc độ without having lớn type for a prolonged period of time. The common conversion factor between WPM and CPM is 5. It is also used occasionally for associating the tốc độ of a reader with the amount they have read. CPM has also been applied lớn 20th century printers, but modern faster printers more commonly use PPM (pages per minute).

The fastest typing tốc độ ever, 216 words per minute, was achieved by Stella Pajunas-Garnand from Chicago in 1946 in one minute on an IBM electric^{[11][12][13][14]} using the QWERTY keyboard layout.^[15][16] As of 2005, writer Barbara Blackburn was the fastest English language typist in the world, according lớn The Guinness Book of World Records. Using the Dvorak keyboard layout, she had maintained 150 wpm for 50 minutes, and 170 wpm for shorter periods, with a peak tốc độ of 212 wpm. Barbara Blackburn, who failed her QWERTY typing class in high school, first encountered the Dvorak layout in 1938 and then she quickly learned lớn achieve very high speeds of typing, also she occasionally toured giving speed-typing demonstrations during her secretarial career. She appeared on Late Night with David Letterman on January 24, 1985, but felt that Letterman made a spectacle of her.^[17]

The recent emergence of several competitive typing websites has allowed fast typists on computer keyboards lớn emerge along with new records, though many of these are unverifiable. Some notable, verified records include 255 wpm on a one-minute, random-word test by a user under the username slekap and occasionally bailey,^[18] 213 wpm on a 1-hour, random-word test by Joshua Hu,^[19] 221 wpm average on 10 random quotes by Joshua Hu,^[20] and first place in the 2020 Ultimate Typing Championship by Anthony Ermollin based on an average of 180.88 wpm on texts of various lengths.^[21][22] These three people are the most commonly cited fastest typists in online typing communities.^{[citation needed]} All of their records were mix on the QWERTY keyboard layout.

Using a personalized interface, physicist Stephen Hawking, who suffered from amyotrophic lateral sclerosis, managed lớn type 15 wpm with a switch and adapted software created by Walt Woltosz. Due lớn a slowdown of his motor skills, his interface was upgraded with an infrared camera that detected "twitches in the cheek muscle under the eye."^[23] His typing tốc độ decreased lớn approximately one word per minute in the later part of his life.^[24]

Numeric entry[edit]

The numeric entry, or 10-key, tốc độ is a measure of one's ability lớn manipulate a numeric keypad. Generally, it is measured in Keystrokes per Hour or KPH.

Text-entry research[edit]

Error analysis[edit]

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, tốc độ 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 lớn 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:

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

Deconstructing the text input process[edit]

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

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• The two classes Correct and Incorrect Not Fixed comprise all of the characters in transcribed text.
• Fixes (F) keystrokes are easy lớn identify, and include keystrokes such as backspace, delete, cursor movements, and modifier keys.
• 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[edit]

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

MSD Error Rate =

Key strokes per character (KSPC)[edit]

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

The three shortcomings of the KSPC statistic are listed below:

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

Further metrics[edit]

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

Error correction efficiency refers lớn the ease with which the participant performed error correction.

• Correction Efficiency = IF/F

Participant conscientiousness is the ratio of corrected errors lớn the total number of error, which helps distinguish perfectionists from apathetic participants.

• Participant Conscientiousness = IF / (IF + INF)

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[edit]

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.^[25]

Tools for text entry research[edit]

Currently, two tools are publicly available for text entry researchers lớn record text entry performance metrics. The first is TEMA^[26] that runs only on the Android (operating system). The second is WebTEM that runs on any device with a modern Web browser, and works with almost all text entry technique.^[27]

Keystroke dynamics[edit]

Keystroke dynamics, or typing dynamics, is the obtaining of detailed timing information that describes exactly when each key was pressed and when it was released as a person is typing at a computer keyboard for biometric identification,^[28] similar lớn speaker recognition.^[29] Data needed lớn analyze keystroke dynamics is obtained by keystroke logging.

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The behavioral biometric of Keystroke Dynamics uses the manner and rhythm in which an individual types characters on a keyboard or keypad.^[30]

See also[edit]

• Muscle memory
• Stenotype
• Copy typist
• Audio typist
• Data entry clerk
• Speed typing contest
• Typesetting
• Typing Day

References[edit]

External links[edit]

• Media related lớn Typing at Wikimedia Commons