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Consider a situation in which predicted probabilities of a given event of interest are estimated using two models that share all risk factors, except for one new marker. Let us categorize the predicted probabilities based on these two models into a set of clinically meaningful ordinal categories of absolute risk and then cross-tabulate these two classifications. Define upward movement (up) as a change into higher category based on the...
One tail and two tail p-value.
When a large number of samples is analyzed by mass spectrometry instrument, a common issue is the multiple spectra peaks alignment. In fact, the statistical analysis generally requires a data matrix, easily to import from a file to the software....
3 columns array.
column1 (the left): sample ID or sample number
column2 and column3: instrument1 and instrument 2 outout
Bland Altman scatter plot with mean difference line and +-2 SD lines.
Passing & Bablok described this procedure in the 1983.
This procedure is ideal if you want to compare 2 different methods (instrument) which measure the same chemical analyte in the same sample.
Classical linear regression method...
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