Average absolute deviation

Referenced to 806 data points for binary systems. Equation 8-70A gives absolute deviation of 13.2%, which is about as accurate, or perhaps more so, than other efficiency equations. Equation 8-70B uses the same data and has an absolute average deviation of 10.6%. See Example 8-13 for identification of dimensionless groups. 

Correlation Average Deviation Absolute Average Deviation Bias Maximum Deviation... 

The Nemeth Kennedy equation reproduced the 579 data points used in its development with an absolute average deviation of 7.4 percent.14... 

The equation of McFarland, Sigmund, and Van Winkle [Hyd. Proc., 111-114 (Jul. 1972)] is based primarily on data obtained in pilot plant and laboratory units. It shows a weak dependence on several dimensionless groups. About 800 data points were correlated. The absolute average deviation was 10.6%, and 90% of the calculated values were within 24% of the experimental ones. 

Absolute average deviations to the fit of the Englezos-Bishnoi data for CH4, C2H6, and their mixtures, are 22%, 14%, and 30% respectively, relative to the experimental inaccuracies on the order of 10-20%. That is, the mixture predictions may be in error by 30%. While many predictions work well, others failed for methane at long times. 

Ihble 1 Molar composition (mole/%) of the five gaseous mixtures and the absolute average deviations (in %) obtained using different equations of state (EOS), over the full pressure and temperature ranges investigated... 

AAD absolute average deviation a,b equation of state parameters f fugacity... 

The reliability of the network model can be assessed by comparing the predictions (recalls) with measurements expressed in terms of the absolute relative deviation (ARD%) and absolute average deviation (AAD%) as. 

To compare the different mechanisms and models, an absolute average deviation (AAD) of predicted weight loss data, with respect to experimental weight loss data, was calculated for each proposed mechanism using the following equation ... 

Each vertical line labeled (xj — x,) is the absolute average deviation of the set from the true value. (Data from C. O. Willits and C. L. Ogg, J. Assoc. Offic. Anal. Chem., 1949,32, 561. With permission.)... 

Correlation Absolute average deviation, % Absolute average deviation, Btu/lb Absolute average deviation, %... 

In Tables 21.4-21.6, we showed the calculated chemical shifts of functional groups for the polymer models with the experimental ones for polymers in solution. The calculated results are also in good accordance with experimental values in absolute average deviations of 4.42 ppm. 

In the present work, the mass transfer performance characteristics of MEA-CO2 and DETA-CO2 systems in terms of the volumetric overall mass transfer coefficient (AgOv) were investigated. By means of determination of KqO, it is simple and effective to describe the mass transfer behavior of any solvent in the packed column. (Aroonwilas and Tontiwachwuthikul, 1998) [1] and Maneeintr et al, 2010 [6]) have successfully adopted this method to study the mass transfer performance for CO2 absorption into 2-amino-2-methyl-l-propanol (AMP) using Sulzer EX structured packing and into 4-diethylamino-2-butanol (DEAB) using Sulzer DX structured packing, respectively. Lastly, the predictive correlations of Kqu, for CO2 absorption into aqueous solutions of MEA and DETA were developed. The predicted Ag v results were then compared with the experimental results in terms of absolute average deviation (AAD). 

A good agreement between predicted and experimental Kao values was observed with an absolute average deviation (AAD) of 14%. 

A good agreement between predicted and experimental K a values was observed with an absolute average deviation (AAD) of 16%. However, the new correlation developed for DETA-CO2 systems might not be applicable for other absorption columns, especially to those containing structured packing. Further experimental testing is necessary to expedite the application of new mass transfer correlation for DETA-CO2 system to industry application. 

An explicit account of hydrogen bonding in water by the equation of state results in substantial improvement of the correlation of (water + hydrocarbon) LEE. In Figure 4.6, LEE for (water + hexane) is shown. The CPA equation of state correlates the water solubility with an Absolute Average Deviation of 4.5 % and reasonable agreement is obtained between experiment and calculations for hexane solubility. Unfortunately, the minimum of the solubility of hydrocarbon cannot be captured with a single temperature-independent binary interaction parameter. 

Table 14.1 Percentage absolute average deviations (%AAD) between predicted results and experimental data for the adsorption isotherms (x) and total amounts adsorbed (n) using the multicomponent Langmuir and lAST models. The first value is the % AAD in x and the second is the % AAD In n...

Using the GC-EoS model and Sets 1 and 2 of funetional groups the ethyl lactate vapor pressure was predieted and eompared with the experimental data reported by Inal. The absolute average deviations ... 

Figure 20.4.15 shows a comparison between the experimental solubility given in Tables 20.4.14 to 20.4.16 (ethyl laetate with less than 0.03 wt% of water) and the solubility calculations performed with the UNIFAC model. The absolute average deviations (AAD) were calculated as follows ... 

The same author[85] used artificial neural-networks and group contribution method (based on the mass of selected fragments) to calculate the density of several families of the ILs at several temperatures. With this model was obtained an absolute average deviation of 0.26% for a prediction set of 83 peints. 

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