Source: DiCecio, Riccardo
Real Investment is calculated as nominal investment (https://fred.stlouisfed.org/series/NINV) divided by investment deflator (https://fred.stlouisfed.org/series/INVDEF) multiplied by 100.
For additional details see: R. DiCecio (2009). "Sticky wages and sectoral labor comovement," Journal of Economic Dynamics and Control, 33(3): 538-53. (http://dx.doi.org/10.1016/j.jedc.2008.08.003).
DiCecio, Riccardo, Real Investment [RINV], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/RINV, April 16, 2021.