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The repeatability studies were carried out with 5 replicate determinations of the same samples weighed individually five times.
For the irregularity indexes, random errors were calculated according to Dahlberg's formula (Se2 = Σd2/2n), where Se2 is the error variance and d is the difference between two determinations of the same variable [33].
Random errors were calculated according to Dahlberg's formula (Se2 = ∑d 2/2n) [18], where S 2 is the error variance and d is the difference between 2 determinations of the same variable and the systematic errors were evaluated with dependent t tests, at P < 0.05 [19].
The random errors were calculated according to Dahlberg's formula (Se2 = Σd2/2n) [27], where Se2 is the error variance and d is the difference between two determinations of the same variable and the systematic errors with dependent t tests, at P < 0.05 [28 30].
Systematic errors were evaluated with dependent t tests at p < 0.05, and casual errors were calculated according to Dahlberg's formula (Se2 = Σd2/2n), where Se2 is the error variance and d is the difference between two determinations of the same variable [25].
The sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) of interview information for having any headache, headaches ≥50%% of the days, and very frequent medication during the previous year were calculated relative to diary determinations of the same parameters.
Similar(52)
Each value represents the average of two independent determinations on the same chip surface.
These results are comparable with results obtained for polarographic determination of the same vitamins using mercury electrodes.
It therefore makes possible the determination of liquid and vapour phase densities and composition at prescribed pressures and temperatures for two phases as well as the determination of the same quantities for a second liquid phase should one exist.
The adiabatic scanning calorimeter allows the determination of the same parameters as a DSC, combined with a direct measurement of the enthalpy curve h(T), but it does not suffer from the phase transition deformation because of a fundamentally different measurement principle [29, 30, 31, 32].
The suggested methods have the advantage over the previously published spectrophotometric method for determination of the same combination in that they did not require a preliminary separation step and able to resolve the ternary mixture, with severe overlapping spectra, with competent sensitivity and selectivity.
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