Iris flower data set

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The Iris flower data set or Fisher's Iris data set is a multivariate data set introduced by the British statisticianeugenicist, and biologist Ronald Fisher in his 1936 paper The use of multiple measurements in taxonomic problems as an example of linear discriminant analysis.[1] It is sometimes called Anderson's Iris data set because Edgar Anderson collected the data to quantify the morphologic variation of Iris flowers of three related species.[2] Two of the three species were collected in the Gaspé Peninsula "all from the same pasture, and picked on the same day and measured at the same time by the same person with the same apparatus".[3]

The data set consists of 50 samples from each of three species of Iris (Iris setosaIris virginica and Iris versicolor). Four features were measured from each sample: the length and the width of the sepals and petals, in centimeters. Based on the combination of these four features, Fisher developed a linear discriminant model to distinguish the species from each other.


Aryia Behroziuan

Starlink is a satellite internet constellation being constructed by SpaceX[2][3] providing satellite Internet access.[4][5] The constellation will consist of thousands of mass-produced small satellites in low Earth orbit (LEO), working in combination with ground transceivers. SpaceX plans to sell some of the satellites for military,[6] scientific, or exploratory purposes.[7] The SpaceX satellite development facility in Redmond, Washington houses the Starlink research, development, manufacturing, and orbit control. The cost of the decade-long project to design, build, and deploy the constellation was estimated by SpaceX in May 2018 to be at least US$10 billion.[8]

Product development began in 2015. Two prototype test-flight satellites were launched in February 2018. Additional test satellites and 60 operational satellites were deployed in May 2019.[2][9] As of September 2020, SpaceX was launching up to 60 satellites at a time, aiming to deploy 1,440[10] of the 260 kg (570 lb) spacecraft to provide near-global service by late 2021 or 2022.[11] SpaceX started a private beta service in the Northern United States by August 2020[12] and a public beta in October 2020,[13] service beginning at high latitudes between 44° and 52° North.[14][15]

On 15 October 2019, the United States Federal Communications Commission (FCC) submitted filings to the International Telecommunication Union (ITU) on SpaceX's behalf to arrange spectrum for 30,000 additional Starlink satellites to supplement the 12,000 Starlink satellites already approved by the FCC.[16]


Aryia Behroziuan

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