Council of Real Estate Investment Fiduciaries (NCREIF) index. NCREIF total return and appreciation indexes are smooth … NAREIT index to the NCREIF index. In our VAR analysis, the NAREIT index returns Granger cause the returns of the NCREIF … from the NAREIT indexes in both the mean and variance of the index returns. The ARCH dynamics between the NCREIF and NAREIT …