# An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 10 Search : regression
 linear regression   وایازی ِ خطی   vâyâzi-ye xattiFr.: regression linéaire   In statistics, a regression method that establishes a linear relationship between two random variables.→ linear; → regression. nodal regression   پسرفت ِ گرهی   pasraft-e gerehiFr.: regression nodale   For a ring inclined to the planet's equator, the points at which the ring crosses the equator (nodes) slowly move around the planet (regress) in a direction opposite to that of the ring's orbital motion. (Ellis et al., 2007, Planetary Ring Systems, Springer).→ nodal; → regression. regression   ۱) پسرفت؛ ۲) وایازی، وایازش   1) pasraft (#); 2) vâyâzi (#), vâyâzeš (#)Fr.: régression   1) Astro.: → retrograde motion. 2) Geology: A retreat of the sea from land areas. Possible causes include a drop in sea level or uplift. 3) Math.: A method for fitting a curve through a set of points using some goodness-of-fit criterion. The most common type of regression is → linear regression.From L. regression-, from regress-, stem of regredi "to go back," from → re- "back" + gradi "to step, walk."1) → retrograde. 2) On the model of → progression, from vâ-→ re- + yâzi, yâzeš, verbal noun of yâzidan "to stretch out the arms; grow up" (Parthian Mid.Pers. y'd "to reach a goal, come to, stretch out;" Av. yat- "to reach, take one's place," yaiiata "places," frā-iiatāt "has reached;" cf. Skt. yat- "to be in place, put in place, line up;" PIE base *iet- "to be in place"). regression analysis   آنالس ِ وایازش   anâlas-e vâyâzešFr.: analyse de régression   A statistical technique used to determine the values of parameters for a function that best fits a given set of data.→ regression, → analysis. regression coefficient   همگر ِ وایازش   hamgar-e vâyâzeš (#)Fr.: coefficient de régression   The slope of the straight line that most closely relates two correlated variables. regression curve   خم ِ وایازش   xam-e vâyâzešFr.: courbe de régression   A curve representing a non-linear relationship between two or more → variables.→ regression, → curve. regression equation   هموگش ِ وایازش   hamugeš-e vâyâzešFr.: équation de régression   A mathematical expression that describes the relationship between two or more variables. It indicates the nature of the relationship and, in particular, the extent to which one can predict some variables by knowing others.→ regression, → equation. regression function   کریای ِ وایازش   karyâ-ye vâyâzešFr.: fonction de régression   A mathematical function that describes the relationship between two or more variables in a set of data.→ regression, → function. regression line   خط ِ وایازش   xatt-e vâyâzešFr.: droite de régression   The curve representing a → linear regression. It is a line drawn through a set of data that summarizes the relationship between the → variables being studied.→ regression, → line. regression of the nodes   پسرفت ِ گره‌ها، ~ گوزهرها   pasraft-e gerehhâ , ~ gowzahrhâFr.: régression des noeuds   The slow motion of the → nodes of the Moon's orbit in the opposite direction to the Moon's movement. This westward motion, caused by perturbations of other bodies, mainly the Earth and Sun, has a rate of 19.35 degrees per year, making one rotation in 18.6 years.→ regression; → node.