Experimental carbon-13 chemical shift data show poor correlations with electron density but it is possible to make systematic corrections to the experimental data to improve the correlation with total electron density. The corrections can be construed as a partial separation of factors contributing to carbon-13 screening constants. Total electron densities can be predicted empirically.
R. G. Jones and P. Partington, J. Chem. Soc., Faraday Trans. 2, 1972, 68, 2087 DOI: 10.1039/F29726802087
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