For example, the EH method, log-linear smoothing, Davidian-curve IRT, and Ramsay-curve IRT, have been proposed to estimate the distribution of latent ability simultaneously with the item parameters.

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INTRODUCTION . The soil water retention curve (SWRC) and the pore size distribution curve (PSDC) have been widely used to characterize the soil structure (Assouline et al. 1997, Hajnos et al. 2006, ...

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