description: a statistic used in hypothesis testing to indicate the strength of the evidence against the null hypothesis
116 results
by Derek Künsken · 1 Oct 2018 · 430pp · 107,765 words
distribution suggests to me that it has infected support systems.” “That’s not random,” Cassandra said. “No.” Cassandra had a brief urge to recalculate the p-value to verify the non-randomness, but Iekanjika wouldn’t care and Bel would already have calculated it. “The infection pattern doesn’t follow the systems
by Alex Edmans · 13 May 2024 · 315pp · 87,035 words
World Cup on stock markets – Alex Edmans and CNN’s Richard Quest’. Available at https://bit.ly/soccercnn 6. Data is Not Evidence: Causation * The ‘p-value’ corresponds to the significance level, which needs to be 0.05 or lower for a result to be deemed significant. † More technical terms for ‘common
by Robin Wall Kimmerer
-than-human world. I’ve never met an ecologist who came to the field for the love of data or for the wonder of a p-value. These are just ways we have of crossing the species boundary, of slipping off our human skin and wearing fins or feathers or foliage, trying
by Annie Duke · 6 Feb 2018 · 288pp · 81,253 words
for others to assess the quality of the information being presented, systematized through peer review before publication. Confidence in the results is expressed through both p-values, the probability one would expect to get the result that was actually observed (akin to declaring your confidence on a scale of zero to ten
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football game, 56–59 Prisoner’s Dilemma (Poundstone), 19, 246n privacy, 157 Prospect Theory, 36 Prudential Retirement, 185 psychology, 145–47, 149 Pulitzer, Joseph, 60 p-values, 72 Rashomon, 157 Rashomon Effect, 157–58 rationality and irrationality, 11, 43, 51, 64, 181n, 183, 204 Ulysses contracts and, 201, 203 words, phrases, and
by Eli Bressert · 14 Oct 2012 · 62pp · 14,996 words
elements sample = np.random.randn(100) # normaltest tests the null hypothesis. out = stats.normaltest(sample) print('normaltest output') print('Z-score = ' + str(out[0])) print('P-value = ' + str(out[1])) # kstest is the Kolmogorov-Smirnov test for goodness of fit. # Here its sample is being tested against the normal distribution. # D is
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closer it is to 0 the better. out = stats.kstest(sample, 'norm') print('\nkstest output for the Normal distribution') print('D = ' + str(out[0])) print('P-value = ' + str(out[1])) # Similarly, this can be easily tested against other distributions, # like the Wald distribution. out = stats.kstest(sample, 'wald') print('\nkstest output for
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the Wald distribution') print('D = ' + str(out[0])) print('P-value = ' + str(out[1])) Researchers commonly use descriptive functions for statistics. Some descriptive functions that are available in the stats package include the geometric mean (gmean
by Linsey McGoey · 14 Sep 2019
by Adam Goucher and Tim Riley · 13 Oct 2009 · 351pp · 123,876 words
being told, “Looks like the average of your generator is 7 when it should be 8,” than to being told, “I’m getting a small p-value from my Kolmogorov-Smirnov test.” Range Tests If a probability distribution has a limited range, the simplest thing to test is whether the output values
by Michael Geier · 6 Jan 2011 · 336pp · 163,867 words
by Cesar Hidalgo · 1 Jun 2015 · 242pp · 68,019 words
of the country’s population. 5. In the case of Honduras and Argentina the probability of the observed overlap (what is known academically as its p-value) is 4.4 × 10–4. The same probability is 2 × 10–2 for the overlap observed between Honduras and the Netherlands and 4 × 10–3
by Thomas H. Davenport and Jinho Kim · 10 Jun 2013 · 204pp · 58,565 words
collected and tested to see how “unusual” it is under the temporary assumption that H0 is true. Rare or unusual data (often represented by a p-value below a specified threshold) is an indication that H0 is false, which constitutes a statistically significant result and support of the alternative hypothesis. Independent variable
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predictors would serve as independent variables. Alternative names are explanatory variable, predictor variable, and regressor. p-value: When performing a hypothesis test, the p-value gives the probability of data occurrence under the assumption that H0 is true. Small p-values are an indication of rare or unusual data from H0, which in turn provides support
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that H0 is actually false (and thus support of the alternative hypothesis). In hypothesis testing, we “reject the null hypothesis” when the p-value is less than the significance level a (Greek alpha), which is often 0.05 or 0.01. When the null hypothesis is rejected, the result
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(if H0 were indeed true) for us to doubt H0 and reject it as being true. In practice, this is often assessed by calculating a p-value; p-values less than alpha are indication that H0 is rejected and the alternative supported. t-test or student’s t-test: A test statistic that tests
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error: This error occurs when the null hypothesis is true, but it is rejected. In traditional hypothesis testing, one rejects the null hypothesis if the p-value is smaller than the significance level α. So, the probability of incorrectly rejecting a true null hypothesis equals α and thus this error is also
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reassuring to the wife but persuasive to her husband as well. In statistical hypothesis testing, the probability of 0.003 calculated above is called the p-value—the probability of obtaining a test statistic (e.g., Z-value of 2.75 in this case) at least as extreme as the one that
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hypothesis (H0) is “This baby is my husband’s.” In traditional hypothesis testing, one rejects the null hypothesis if the p-value is smaller than the significance level. In this case a p-value of 0.003 would result in the rejection of the null hypothesis even at the 1 percent significance level—typically
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