I want to calculate the Turnover of my scaled Momentumportfolio (Barroso und Santa-Clara 2015) They described Turnover Ratio with the following formula:

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While i understand the general concept (without Lt):

Why does the weighting factor (Lt) impact the Turnoverratio in the shown way.

If i got a scaling factor (Lt) of 2, everything would be scaled by 2 but the percentage Turnover Ratio wouldn't be the same ?

So in this case a lower (higher) weighting would cause a lower (higher) Turnover Ratio.

Any one able to explain this ?

(the 0.5 is because its a Long-Short Portfolio, so the formula is for each leg)

  • $\begingroup$ How is $L_t$ defined? It seems to be the inverse of how I would define leverage. $\endgroup$
    – Alex C
    Commented Sep 20, 2019 at 1:41
  • 1
    $\begingroup$ The Authors define the weighting of the strategy as : target volatility/estimated volatility) So the strategy is scaled up, if the estimated volatility is low. So a higher weighting (Lt) would result in a scaled up strategy $\endgroup$
    – KDMS
    Commented Sep 20, 2019 at 12:51


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