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The standard deviation of a random variable, sample, statistical population, data set, or probability distribution is the square root of its variance. It is algebraically simpler, though in practice less robust, than the average absolute deviation.
Diplomatic correspondence. An 1862 letter of condolence from Abraham Lincoln to Queen Victoria on the occasion of the death of Prince Albert shows the republican salutation "Great and Good Friend". Diplomatic correspondence is correspondence between one state and another and is usually of a formal character. It follows several widely observed ...
Handwriting exemplars are used by a document examiner to determine the writing habits of an individual. Ideally, the exemplars will provide an adequate picture of the writer's habits such that a meaningful comparison can be conducted with the questioned material. There are two types of handwriting exemplars that may be used; request writings ...
Spelling alphabet. A spelling alphabet ( also called by various other names) is a set of words used to represent the letters of an alphabet in oral communication, especially over a two-way radio or telephone. The words chosen to represent the letters sound sufficiently different from each other to clearly differentiate them.
It was devised by the International Phonetic Association in the late 19th century as a standardized representation of speech sounds in written form. [1] The IPA is used by lexicographers, foreign language students and teachers, linguists, speech–language pathologists, singers, actors, constructed language creators, and translators.
Probability density functions (pdfs) and probability mass functions are denoted by lowercase letters, e.g. , or . Cumulative distribution functions (cdfs) are denoted by uppercase letters, e.g. , or . In particular, the pdf of the standard normal distribution is denoted by , and its cdf by .
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