Interpretationįor each test levels the program calculates corresponding Likelihood ratio with 95% Confidence interval.Ĭonfidence intervals for the likelihood ratios are calculated using the "Log method" as given on page 109 of Altman et al. Next, enter the number of cases in the diseased group that test positive and negative at the different test levels. Required inputįirst, select the number of different test levels. The likelihood ratio can be used to calculate the post-test probability of disease from the pre-test probability of disease (see below). Interval likelihood ratios may be more powerful because they use more information contained in the data. When test results have a continuous or ordinal outcome then valuable information is lost when the data are dichotomized for the calculation of sensitivity, specificity and likelihood ratios as in ROC curve analysis. The possibility of importing information from statistical software such as Excel, SPSS, Dbase, Lotus, etc.Allows to calculate likelihood ratios for different test levels from a 2xk table. Also, this program includes tools for analyzing ROC curves and Bland & Altman plots and Passing, Bablok, and Deming regressions to conduct studies and research in ratios.Ī spreadsheet capable of holding 16,384 columns in 100,000 rows MedCalc input can be files from Excel, SPSS, DBase, and Lotus programs or files with SYLK, DIF, or text formats. MedCalc has integrated spreadsheets that can be configured up to more than 100,000 lines, and after collecting and recording statistical information, you can finally prepare a graph from them. This software has a fast, user-friendly, and reliable interface and provides comprehensive tools. MedCalc is a complete and useful software designed to analyze and perform statistical calculations required in natural sciences.
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