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The AX offers new adjustability on two major settings so that you can customize valuations to reflect your own specific outlook for the coming season. By default, The AX (see original intro article here) generates values using each player’s 50th percentile PECOTA projection, and playing time estimates from BP’s Depth Charts. Both of these can be adjusted within the AX interface, allowing you to select custom performance or playing time estimates for as many players as you like, and the AX will automatically adjust the universe of values to reflect these adjustments. The performance selector allows you to apply any of 13 projection levels generated by PECOTA, while the playing time selector applies a linear adjustment to re-calculate counting stats for the specified amount of playing time (PA for hitters or IP for pitchers).

The editable categories are “%” for the percentile projection, “PA” for batter playing time and “IP” for pitcher playing time. By clicking into the blue, linked number you will be presented with the ability to select a given projection, or a slider for PA/IP respectively:

We’re targeting future enhancements to help you assess and manage the cumulative impact of many playing time adjustments, but for now it’s important to remember to keep the total budgeted playing time relatively consistent across all players. We hope you enjoy the new functionality provided by the adjustable playing time sliders in The Ax, as we work to develop additional features.

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Jefferson Airplane
2/16
Is it possible to change percentiles for all players at once, or is it only possible to change these one-player at a time?
Craig Goldstein
2/16
Only one player at a time.
Jefferson Airplane
2/16
Thanks for the update Craig. Any chance that future updates will allow for wholesale changes?
Craig Goldstein
2/16
I will pass it along as a suggestion to the folks who make these functionality changes possible, but I guess I would worry about making complete shifts across the player population to a different percentile? Curious what you're looking for in that scenario/if it might be something we can address differently?
jason neel
2/17
From my point of view, I would be interested to see: if every player in the MLB hit their 90%, who has the upsideiest upside? That would be the point of wholesale percentile changes: to see who the most interesting targets are in terms of rolling dice for their best case scenario.
Craig Goldstein
2/17
Is that not broadly available in the percentile spreadsheets tabs? Understanding the valuations of a specific league aren't baked in, but I'd think you could get what you're looking for out of it?
uiillini
2/16
If I narrow it down to AL or NL only I'm getting no info back. Anyone else getting the same thing?
Joe Streng
2/16
Same here. Tried on Safari and Chrome. Anyone know a fix?
Craig Goldstein
2/16
Hey Joe and Illini, thanks for reporting the issue, we are able to reproduce it and will work on a fix. Will report back on when we have one.
Joe Streng
2/16
Thanks, Craig!
Craig Goldstein
2/16
Hey all, this should be fixed now. Give it a try, if you can
uiillini
2/17
Success!!! Thanks.
Craig Goldstein
2/17
Excellent!
uiillini
2/18
It appears to be back to not working for NL or AL only.How can I tell if my $2 Yoshitomo Tsutsugo is a good keeper value or not two weeks prior to the earliest start of spring training!!!!!!!
William Amspacher
2/16
hola!

so i've entered my league's settings, and the results are...bizarre. basically, most relievers, good and bad, are super, super high. they occupy the top 25-30 pitching spots. meanwhile, gerrit cole's like the 50th pitcher in the ranks.

now, i do have sv+hd instead of sv and ip as an additional category in my league, but i'm not seeing how these results make sense? would it be possible to talk to someone about this? i've tripled-checked the settings.

hitting seems fine, though.
Craig Goldstein
2/17
Hey William, we're able to see the issue you're describing and are looking into this. Will follow up as we can. If you need to be in touch please use cs@baseballprospectus.com and our customer service can assist.
Patrick
2/17
"...it’s important to remember to keep the total budgeted playing time relatively consistent across all players."

Can you explain what this means on a practical level? Does this mean that if I drastically change a playing time estimate, I should increase the playing time of that player's backup?

Also, have you given any thought to allowing specific positions to be de-emphasized? Using my league settings (single catcher, OPS instead of AVG), prices for the best catchers are well over $30 - and with inflation, go much higher once keepers are entered. While these figures may be true due to the lack of depth at the position, but there is also no way anyone in my league is going to pay above mid-$20s for catchers. I'd love to be able to shift those prices down 30-40% across the board without radically changing their percentiles or playing time.
Craig Goldstein
2/17
The AX looks at how much particular stats are worth in the context of league-wide performance: in a simple example, a single stolen base is 'worth' more than a single RBI because there are simply more RBIs available than there are SBs. If you adjust the playing time for a few players in ways that are roughly balanced, you won't meaningfully alter the overall valuation picture across hundreds of players. But if you were really determined and you made many dozens of adjustments, you could create a universe where league-wide there are only 30 projected stolen bases, and suddenly those SBs would be basically priceless.

Re: the de-emphasizing, the answer right now is that the tool takes that scarcity into account and we'd argue is telling you something about catcher value. One possible approach to get the result you want would be to put the elite ones in as keepers at the price you think they'll go for, which will redistribute the money to other places. This could move the "problem" down to lower-tier catchers, but it is worth a look.
Patrick
2/17
Thanks Craig. I wouldn't be looking to make large, across-the-board changes in playing time, so it's good to know how granular I need to be about any reallocations.

As for the catcher issue, I agree that it's telling me quite a bit about the catcher position. It's just jarring to see Salvador Perez at $50+ (after keepers) when I know he's not likely to get more than $25 - and I don't particularly want to be the high bidder even then (but maybe I should!).
Craig Goldstein
2/17
Yeah, I understand the concern there. I think, as with any tool like this, you ultimately know more about the league than the tool does or we do. In terms of behavior that's a big element, and you can tweak it (not the tool, but your application of it) to your advantage.
RYAN WILSON
3/22
How often is The AX updated?