# MStrategy - key points

## definitions

https://www.sr-sv.com/a-basic-theory-of-momentum-strategies/

https://www.sr-sv.com/the-relation-between-value-and-momentum-strategies/

## implementations

signal $S_n (t) = (1/\sigma_n) (p(t-1) - aver(p(t-1)) )$

where $p(t-1)$ is the price on the previous step

$aver(p(t-1))$, as an exponential moving average of past prices (excluding $p(t)$ itself) with a decay rate equal to n months

quasi-PL $Q_n (t) = \sum_{t' (for t' < t)} sign (S_n (t') ) * \frac{p_n (t'+1) - p_n (t')}{\sigma_n (t'-1)}$

- TSMOM - Moskowitz paper

the excess return $r^s_t$ for instrument s in month t

The TSMOM return for any instrument s at time t is therefore:

$r^{TSMOM,s}_{t,t+1} = [ sign(r^s_{t-12,t}) \frac{40%}{\sigma^s_t} ] * r^s_{t, t+1}$

- https://risk.edhec.edu/sites/risk/files/edhec-working-paper-momentum-strategies-in-futures_1410350911195_0.pdf https://papers.ssrn.com/sol3/papers.cfm?abstract_id=1968996

the same definition as Moskowitz

Throughout the paper, both J and K are measured in months, weeks or days depending on the rebalancing frequency of interest.

We use the notation to denote monthly strategies with **a lookback and holding period of J and K months respectively**

$R^{K, MOM}_J (t,t+K) = [ sign(R^s_{t-J,t}) \frac{40%}{\sigma (t; 60) } ] * R (t, t+K)$