![]() ![]() TS diagram for water with the region near the saturated liquid curve magnified. Following a recent work that illustrates how normalized entropy can represent a promising approach to identify pure noise models, this paper revises the procedure of normalized entropy, proposes some improvements, and illustrates its performance when compared with some well-known traditional techniques in variable selection problems. The reference state for all property values is the liquid at the triple point, for which state the specific internal energy and the specific entropy have been set to zero. The univariate entropy value gives a new and simple method for evaluating the quality of a latent class indicator. Specific entropy in kilo-Joules per kilogram-Kelvin. ![]() At this point the specific enthalpy is 1 890 kJ/kg, and the dryness fraction is 0.72 (see Figure 2.3.9). If this line is followed vertically downwards until 0.04 bar a is reached, the final condition of the steam can be evaluated. To the best of the authors’ knowledge, the idea has not been explored in the literature since then, despite many noteworthy advantages that have been pointed out by Amos Golan and coauthors, such as: it is simple to perform, even for a large number of variables (useful in some big data problems) it allows the use of non-sample information (easily incorporated in the optimization structure) and it can be implemented for ill-posed models (frequently observed in real-world problems). At the initial condition, the entropy is approximately 6.25 kJ/kg ☌. In case of wet steam, the actual entropy can be calculated with the vapor quality, x, and the specific entropies of saturated liquid water and dry steam: swet ss x + (1 x ) sl. A variable selection procedure in regression analysis using a normalized entropy measure was firstly proposed in 1996, by Amos Golan, George Judge and Douglas Miller, in the book Maximum Entropy Econometrics – Robust Estimation with Limited Data. Similarly, the specific entropy of saturated liquid water (x0) and dry steam (x1) can be picked from steam tables. ![]()
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