Liquidity Filter

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09/18/2017 at 8:13 AM #46451 quote

juanj
Participant

Master

Good Day Guys

I am in the process of developing a screener and am trying to find an effective way to filter out low liquidity stocks.

I am thinking about using a volume filter (Average[x](volume) > 1000) and maybe a gap screener (maximum x amount of gaps in last x days).

But I would appreciate any ideas or if someone maybe already developed a nice liquidity filter I would appreciate if you can share it.

Thanks

09/18/2017 at 12:58 PM #46500 quote

juanj
Participant

Master

@Nicolas, your input, and experience will be appreciated.

09/19/2017 at 8:30 AM #46563 quote
Nicolas
Keymaster

Legend
You can check the Market Capitalization with this code:
```
marketcap = close*volume>=300000000//market cap
```
Of course, you can adapt the ‘300000000’ to filter more or less the stocks you want to find.

juanj thanked this post
09/19/2017 at 4:01 PM #46615 quote

juanj
Participant

Master

Thank You Nicolas.

Only problem with that is that as you know not all tradable instruments have volume available.

I do make use of the Market Cap column in the screener window though when sorting the results.

However was hoping of a more versatile technique to measure liquidity using price action for example.

09/20/2017 at 7:36 AM #46642 quote

Nicolas
Keymaster

Legend

Rough early morning ideas:

_ check how many times a short term ATR has crossed a long term averaged one within the last X periods.

_ check Rate Of Change behavior compared to long term one.

Without Volumes, it’s all about price VS time.

09/20/2017 at 9:05 AM #46654 quote
juanj
Participant

Master
Great ideas! So how would we incorporate that?

Do a few tests using known liquid and illiquid stocks and measure behavior or expected ranges using something like the below?

ATR Crosses:
```
NearATR = AverageTrueRange[3]
LongATR = AverageTrueRange[21]
ATRCross = 0

For i = 1 to 50 Do
If (NearATR crosses over LongATR) or (NearATR crosses under LongATR) Then
ATRCross = ATRCross + 1
EndIf
Next

//Return ATRCross As "ATRCross"
```
Rate of change:
```
EMAperiod = 13
ROCperiod = 21
 
EMA = exponentialaverage[EMAperiod](close)
SRoC = ( EMA - EMA[ROCperiod] ) / ( EMA[ROCperiod] ) * 100

AverageSROC = Average[21](SROC)
```
09/20/2017 at 9:40 AM #46665 quote
Nicolas
Keymaster

Legend
I would recommend something like this instead for the ATR crosses:
```
NearATR = AverageTrueRange[7]
LongATR = average[100](nearATR)//AverageTrueRange[21]
ATRCross = 0
 
For i = 1 to 50 Do
If (NearATR[i] crosses over LongATR[i]) Then
ATRCross = ATRCross + 1
EndIf
Next
 
Return ATRCross As "ATRCross"
```
juanj thanked this post

ATR-crossing-count.png
09/20/2017 at 9:59 AM #46672 quote

juanj
Participant

Master

Yes, I like that, noticed that I forgot to specify the [i] in my code (typed it out without PRT open).

Now I just need to look up a few stocks to get an idea of an acceptable Average ATRCross value.
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