Can't find CMRR option

[avn]

According to Deck Options - Anki Manual

Compute Minimum Recommended Retention

Compute minimum recommended retention (CMRR) attempts to find the desired retention value that leads to the most material learned, in the least amount of time. The calculated number can serve as a reference when deciding what to set your desired retention to. You may wish to choose a higher desired retention, if you’re willing to trade more study time for a greater retention rate. However, setting your desired retention lower than the minimum is not recommended, as you’ll spend more time studying than necessary, due to increased forgetting.

I’m not sure if this FSRS documentation is outdated? Using Anki Version ⁨25.07.5 (7172b2d2)⁩ I can’t find that option.

[Danika_Dakika]

@avn

Using Anki Version ⁨25.07.5 (7172b2d2)⁩ I can’t find that option.

With FSRS-6 (starting in Anki 25.07), CMRR was no longer giving useful information, so it was removed.

[A_Blokee]

Add removed notice for CMRR

I’ll make a pr to add the fact that is removed to the manual.

[avn]

@Danika_Dakika

FSRS-6

Can you elaborate more? Have there been any discussions related to this before?

I have decks that I want to learn long-term and decks I want to focus on to master in a short period. And CMRR seems to be the right tool for that.

[Danika_Dakika]

There’s not a lot to discuss. The feature did not work with FSRS-6, so it wouldn’t really help you with what you’re trying to do.

@avn

decks that I want to learn long-term and decks I want to focus on to master in a short period.

I’m not sure it would help with that. CMRR was about finding the lowest possible retention goal that wouldn’t increase your workload. For long-term decks, if you’re happy with lower retention, you should choose a retention goal that satisfies you. For focused/short-period decks, you’d ordinarily want to turn up your retention goal to shorten intervals.

[avn]

@Danika_Dakika

The feature did not work with FSRS-6

Did not work with FSRS-6 by design or because of a bug? Could you link to any github issues? I’m interested to read why.

@Danika_Dakika

CMRR was about finding the lowest possible retention goal that wouldn’t increase your workload

Yes. This sounds like a desirable goal. Here’s the rephrase by https://github.com/open-spaced-repetition/fsrs4anki/blob/main/docs/tutorial.md:

the value of the desired retention that gives you the most efficient study plan.
…
Previously, the goal was to find the value of desired retention that would allow you to remember as much as possible within the given time constraints. Now the goal is to find the value of desired retention that minimizes the workload/acquired knowledge ratio. For more details, please read this: The Optimal Retention · open-spaced-repetition/fsrs4anki Wiki · GitHub.

So I’m confused about why you say “I’m not sure it would help with that.”

[Danika_Dakika]

@avn

Could you link to any github issues? I’m interested to read why.

Check these, or just search CMRR here or in github.

Replace CMRR with workload-vs-DR graph (+more)

Especially when paired with FSRS-6, CMRR is practically useless. It almost always gives 70% as output and users can’t choose DR below 70% anyway. @Expertium has tried various methods to produce higher values, without much success. However, a more important issue is that it gives just a single value, which isn’t helpful for users who want to decide what DR value will give them the best compromise between retention and workload based on their priorities. Some users may want high retention despite…

Expertium

@avn

So I’m confused about why you say “I’m not sure it would help with that.”

I said that because what you asked about didn’t sound like you would be interested in a low-retention solution. But you can continue using the exact same DR you were using with FSRS-5, and it should work out similarly with FSRS-6.