231
Understanding Your Agilent ChemStation
Agilent Technologies
11
Evaluating System Suitability
Noise Determination 235
Noise Calculation Using Six Times the Standard Deviation 235
Noise Calculation Using the Peak-to-Peak Formula 236
Noise Calculation by the ASTM Method 237
Signal-to-noise calculation 239
Drift and Wander 239
Calculation of Peak Symmetry 240
System Suitability Formulae and Calculations 242
General Definitions 243
Void Volume 243
Retention Time of Unretained Compound t (m) [min] 243
Performance Test Definitions 244
Statistical Moments 244
Statistical Moments, Skew and Excess 245
True Peak Width Wx [min] 246
Capacity Factor (USP), Capacity Ratio (ASTM) k' 246
USP Tailing Factor (USP) t 246
Number of Theoretical Plates per Column (USP, ASTM) n 247
Number of Theoretical Plates per Meter N [1/m] 248
Relative Retention (USP, ASTM), Selectivity Alpha 248
Resolution (USP, ASTM) R 249
Definitions for Reproducibility 250
Sample Mean M 250
Sample Standard Deviation S 250
Relative Standard Deviation RSD[%] (USP) 251
Standard Deviation of the Mean SM 251
Confidence Interval CI 252
Regression Analysis 253
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