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2. Contrast (vision) - Wikipedia

   en.wikipedia.org/wiki/Contrast_(vision)

   Contrast (vision) Six renditions of a rocky shore photo with incremental contrast levels, clockwise from bottom left. Contrast is the difference in luminance or color that makes an object (or its representation in an image or display) visible against a background of different luminance or color. The human visual system is more sensitive to ...

3. Odds ratio - Wikipedia

   en.wikipedia.org/wiki/Odds_ratio

   An odds ratio ( OR) is a statistic that quantifies the strength of the association between two events, A and B. The odds ratio is defined as the ratio of the odds of A in the presence of B and the odds of A in the absence of B, or equivalently (due to symmetry ), the ratio of the odds of B in the presence of A and the odds of B in the absence ...

4. Fibonacci retracement - Wikipedia

   en.wikipedia.org/wiki/Fibonacci_retracement

   The 61.8% (0.618) Fibonacci retracement that is often used by financial analysts corresponds to the golden ratio. Criticism. Extensive backtests of Fibonacci retracement over thousands of stocks have shown that the retracements values of 38%, 50%, and 62% had been no likelier to appear than any other of the possible retracement values.

5. Median lethal dose - Wikipedia

   en.wikipedia.org/wiki/Median_lethal_dose

   Median lethal dose. In toxicology, the median lethal dose, LD50 (abbreviation for " lethal dose, 50%"), LC50 (lethal concentration, 50%) or LCt50 is a toxic unit that measures the lethal dose of a given substance. [1] The value of LD 50 for a substance is the dose required to kill half the members of a tested population after a specified test ...

6. Ratio - Wikipedia

   en.wikipedia.org/wiki/Ratio

   In mathematics, a ratio ( / ˈreɪʃ ( i) oʊ /) shows how many times one number contains another. For example, if there are eight oranges and six lemons in a bowl of fruit, then the ratio of oranges to lemons is eight to six (that is, 8:6, which is equivalent to the ratio 4:3). Similarly, the ratio of lemons to oranges is 6:8 (or 3:4) and the ...

7. Orders of magnitude (numbers) - Wikipedia

   en.wikipedia.org/wiki/Orders_of_magnitude_(numbers)

   10 8. 100 000 000; long and short scales: one hundred million) Demography: The population of the Philippines was 100,981,437 in 2015. Internet – YouTube: The number of YouTube channels is estimated to be 113.9 million. Info – Books: The British Library holds over 150 million items. The Library of Congress holds approximately 148 million items.