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likelihood ratio

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likelihood ratio

usually preceded by "maximum" (that is, maximum likelihood ratio), this ratio maximizes the probability that the parameters in the ratio agree with the empirically observed data.
Farlex Partner Medical Dictionary © Farlex 2012

like·li·hood ra·ti·o

(līk'lē-hud rā'shē-ō)
The ratio of the probability of a test result among patients with a certain disease or disorder to the probability of that same test result among patients who do not have the targeted disease or disorder.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

likelihood ratio

The percentage of ill people with a given test result divided by the percentage of well people with the same result. Ratios near unity should not influence decisions. This useful guide to refining clinical diagnosis is little used mainly because of its complexity; The Fagan nomogram can simplify the matter.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
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References in periodicals archive
Shepherd, "DbEmpLikeGOF: An R package for nonparametric likelihood ratio tests for goodness-of-fit and two-sample comparisons based on sample entropy," Journal of Statistical Software, vol.
Table 5 demonstrate the value of the likelihood ratio statistic after the element is incorporated inside the model.
Again, we can get fancy and place the odds and the likelihood ratio on a logarithmic scale.
* Once a weight and a likelihood have been determined for each scenario of the observed evidence, the likelihood ratio is given as the sum of the products of the likelihood and the corresponding prior weight for each scenario in the guilty set divided by the sum of the products of the likelihood and the corresponding prior weight for each scenario in the not guilty set.
Likelihood Ratio Chi-Square value###1890###1802###1839###1663###1721
This lemma shows the importance of the likelihood ratio or the noise distribution function.
For respected simulation study the processes for both models it can be seen that empirical likelihood ratio test confirmed that it has some mild size disturbance mainly for the small sample size which likely caused by the limiting distribution of .
Difference between readings using HemoCue[TM] and HCS, and accuracy of HCS at different cutoff levels of haemoglobin (n=501) Parameter Less than or Less than or equal to 12 g/dL equal to 10 g/dL Sensitivity 0.96 (CI 0.93-0.98) 0.74 (CI 0.65-0.81) Specificity 0.22 (CI 0.15-0.3) 0.84 (CI 0.8-0.87) PPV 0.75 (CI 0.71-0.79) 0.56 (CI 0.47-0.64) NPV 0.69 (CI 0.53-0.81) 0.92 (CI 0.89-0.95) Likelihood ratio (positive) 1.23 4.63 Likelihood ratio (negative) 0.18 0.31 Efficiency 75% 82% Correlation coefficient 0.7 0.75 Parameter Less than or equal to 7 g/dL Sensitivity 0.83 (CI 0.51-0.98) Specificity 0.99 (CI 0.97-0.98) PPV 0.71 (CI 0.43-0.9) NPV 0.99 (CI 0.98-1.0) Likelihood ratio (positive) 83 Likelihood ratio (negative) 0.17 Efficiency 99% Correlation coefficient 0.87
The score had a sensitivity of 91.9%, a specificity of 79.0%, and a positive likelihood ratio of 4.39 for diagnosis of appendicitis.
The sensitivity, specificity, PPV, NPV, and likelihood ratio positive and likelihood ratio negative of falciparum and vivax arm have been calculated using 2x2 table with Peripheral blood smear as gold standard (Tables 2, 3 and 4).
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