Criterion PRESS

Alexander, G. J. and H. Limenfeld (1975). Positive Guidance in Traffic Control. Criterion Press, locationxx... 

The number of components N is incremented by one and the entire procedure is repeated to arrive at a PRESS(A + 1). In other words, for A + 1 = 2, two principal components would be extracted and used to predict the deleted data values. As N approaches the tme number of significant components, the prediction should improve, and thus the PRESS should decrease. As the significant number is passed, noise begins to be included within the model, which has low predictive abiUty. At this point, the PRESS should start to increase again. Thus the basic type of criterion used in cross-vaUdation to select is that when... 

The selection of the number of PLS-components to be included in the model was done according to the PRESS criterion (Section 36.3). Note that the result is comparable to the one which we obtained earlier by means of the simple Hansch analysis (Section 37.1.1). Hence, in this case, there is no obvious benefit to include a quadratic term of log P in the model. 

Shai, I., 1967, The Mechanism of Nucleate Pool Boiling Heat Transfer to Sodium and the Criterion for Stable Boiling, Ph.D. thesis, Massachusetts Institute of Technology, Cambridge, MA. (2) Shapiro, A. H., 1953, The Dynamics and Thermodynamics of Compressible Fluid Flow, Vol. I, Ronald Press, New York. (3)... 

Fig. 4. Schematic of ammonia synthesis reactor. Reprinted with permission from Comp. Chem. Eng., 14, No. 10, 1083-1100, S. Vasantharajan and L. T. Biegler, Simultaneous Optimization of Differential/Algebraic Systems with Error Criterion Adjustment, Copyright 1990, Pergamon Press PLC.

A simple and classical method is Wold s criterion [39], which resembles the well-known F-test, defined as the ratio between two successive values of PRESS (obtained by cross-validation). The optimum dimensionality is set as the number of factors for which the ratio does not exceeds unity (at that moment the residual error for a model containing A components becomes larger than that for a model with only A - 1 components). The adjusted Wold s criterion limits the upper ratio to 0.90 or 0.95 [35]. Figure 4.17 depicts how this criterion behaves when applied to the calibration data set of the working example developed to determine Sb in natural waters. This plot shows that the third pair (formed by the third and fourth factors) yields a PRESS ratio that is slightly lower than one, so probably the best number of factors to be included in the model would be three or four. 

Differential reinforcement of low rate (DRL) responding in a Skinnerbox has been used in different studies as a test for teratogenic effects on behavior. Prenatal treatment of rats vith haloperidol resulted in normal baseline level of lever pressing in a Skinnerbox for a water reward. However, like after postnatal haloperidol treatment, an increase in the number of sessions to criterion for DRL responding was observed in these animals (ref. 41). Simple acquisition of the bar-press response for water reward was shown to be affected by prenatal treatment vith chlorpromazine, but not by prenatal amphetamine treatment (ref. 137). The response rate, but not response accuracy, in a left-right alternation learning test in a Skinnerbox was increased after neonatal clomipramine treatment ref. 34). 

If an additional latent vector does not improve the error of prediction it has no adequate effect on this model. Noise cannot be predicted and therefore a minimum value of PRESS can be reached. OSTEN [1988], however, stated PRESS as having poor statistical properties and proposed improvements of this criterion. 

Another criterion that is based on the predictive ability of PCA is the predicted sum of squares (PRESS) statistic. To compute the (cross validated) PRESS value at a certain k, we remove the ith observation from the original data set (for i = 1,. .., n), estimate the center and the k loadings of the reduced data set, and then compute the fitted value of the ith observation following Equation 6.16, now denoted as x, . Finally, we set... 

The size of the curium-americium oxide particles is an important criterion in the production of HFIR targets because of the relatively high oxide content in the blend. The oxide particles must be uniformly dispersed in the aluminum pellets/ and the pressed pellets must have a continuous aluminum phase to... 

Regarding the importance of compression tooling to the performance of the tablet press and the quality of the tablets, it is of paramount importance that punches and dies are handled with care. The first criterion is the identification of the tooling that is, punches and dies should be identified according to the standard and be designated by upper punch without key, upper punch with key, lower punch with key, lower punch without key, or die, the reference of the standard (e.g., TSM, EU, JN, ISO), and the punch or die diameter. Punches and dies should also have a marking that includes at least the manufacturer s identification, the number of the punch in the series, and/or the identification number. Upon... 

Susceptibility Exhaltation as a Criterion of Aromaticity," in "Non-Benzenoid Aromatics," Snyder, Ed., Vol 2, Academic Press, NY, 1971. 

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