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Pearson's correlation coefficient is the covariance of the two variables divided by the product of their standard deviations. The form of the definition involves a "product moment", that is, the mean (the first moment about the origin) of the product of the mean-adjusted random variables; hence the modifier product-moment in the name.
Archimedes gives the value of the square root of 3 as lying between 265 / 153 (approximately 1.7320261) and 1351 / 780 (approximately 1.7320512) in Measurement of a Circle. The actual value is approximately 1.7320508, making this a very accurate estimate. He introduced this result without offering any explanation of how he had ...
5∶4: 4∶3: 1.066 327,680: WVGA Wide VGA: 768: ×: 480 8∶5: 8∶5: 1∶1: 368,640: WGA Wide VGA: List of mobile phones with WVGA display: 800: ×: 480 5∶3: 5∶3: 1∶1: 384,000: W-PAL Wide PAL: 848: ×: 480 53∶30: 16∶9: 1.006 407,040: FWVGA: List of mobile phones with FWVGA display: 854: ×: 480 427∶240: 16∶9: 0.999 409,920: SVGA ...
One radian is defined as the angle at the center of a circle in a plane that subtends an arc whose length equals the radius of the circle. [6] More generally, the magnitude in radians of a subtended angle is equal to the ratio of the arc length to the radius of the circle; that is, =, where θ is the magnitude in radians of the subtended angle, s is arc length, and r is radius.
Precision and recall. In statistical analysis of binary classification and information retrieval systems, the F-score or F-measure is a measure of predictive performance. It is calculated from the precision and recall of the test, where the precision is the number of true positive results divided by the number of all samples predicted to be positive, including those not identified correctly ...
For Hispanic women, the highest total fertility rate was in Alabama, at 3.085, and the lowest in Vermont, at 1.200, and Maine, at 1.281. [ 135 ] [ 136 ] Due to the aging and low birth rates among white people , deaths now outnumber births among white people (non-Hispanic) in more than half the states in the country.
Obama won all of the 2004 swing states (states that either Kerry or Bush won by less than 5%) by a margin of 8.5 percent or more except for Ohio, which he carried by 4.5 percent. Obama also defied political bellwethers, becoming the first person to win the presidency while losing Missouri since 1956 and while losing Kentucky and Tennessee since ...