For alternative measures including changes in the market value of households' existing assets, see William G. Gale and John Sabelhaus, Perspectives on the Household Saving Rate, Brookings Papers on Economic Activity (1:1999), pp. 181-224; and Richard Peach and Charles Steindel, A Nation of Spendthrifts?
Changing households market values is an alternative method. 
You can't change the values of households' assets. 