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The Development of GAPPER: Garrioch's Analytical Prospect Point Ranking

The amount of value currently being placed on unproven minor league talent calls for the identification of key attributes that lead to a player reaching the major leagues. This is a commodity that should be heavily invested in. Originally, I did research on the MLB Draft, analyzing college, high school and junior college picks in each round to see what percentage of each made it to the majors. I added the additional variable of position but the results were too variable and not personal enough.

The next step was analyzing performance. I did not use advanced metrics, only the standard counting stats for this process because of the variation in any subjective statistics and scouting at the minor league level. I analyzed many years of data to find the correlation between minor league performance and reaching the major leagues.

I created a weighted point system to represent these numbers for an overall score to track in-season progress but the core of my system comes from full season analysis. Taking players and breaking them into groups of other players with similar results is the first step. The second step is just breaking the groups down one more step based on age, level and results. The third step is more granular and unique to the player. In the end, each player fits into three groups of varying sizes from very unique to very broad depending on how they performed and player comparisons available.

Once these groups were formed, I used the MLB data of the players that made it to the majors and assigned it to each group. This is a simple prediction of how similar minor leaguers performed in the majors and the chance that they even make it. These data sets are applied to each player and regressed based on the success of similar players.

The projections I have created are safe projections, regressed more toward the mean and it isn't rare for the best players to out produce them when I have studied past results. To counteract this deficiency, I created ceiling and floor projections as well, pointing out the potential for a player who could be a star and those that have red flags. Ideally, I need three years of data to run this projection but it's not necessary. It can be done with as little as 50 plate appearances.

This system has a lot to be done to it before it is finished but the structure is sound. I have concentrated on hitters but have a strong system for pitchers started as well it's just not as advanced. Because all of the talent in MLB comes from the minor leagues and one person can't see everyone, this could be a great tool to integrate with a scouting department and developmental staff to identify impact talent. For now, it will be used by anyone reading my blog or Minor League Ball.


  1. Good stuff. Look fwd. to the next update.


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For more information on the draft, check out my new blog MLB Bonus Baby for more information regarding the draft.

Over the next month or so, I will be moving most Draft related info to MLB Draft Prospects. MiLB Prospects will be more focused on current minor leaguers.

These lists are far from perfect but it's a start

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Aaron Nola , RHP , Catholic, Baton Rouge, LA
Aaron Novak , OF/RHP , Germantown Academy (PA)
Aaron Thomassen , RHP , Nathan Hale Seattle WA
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Abram Cartledge , LHP , Thomson, Thomson, GA
Adam Bennett , SS/RHP , …

2017 MLB Draft Top Prospects

1Hagen DannerRHPHS2Ronald WashingtonOFHS4J.J. SchwarzCCollege5Turner LarkinsRHPCollege7Evan SkougCCollege8Keith WeisenbergRHPCollege9Bryce Montes De OcaRHPCollege11Pavin Smith1BCollege12David PetersonLHPCollege12Cobi JohnsonRHPCollege14Keaton McKinneyRHPCollege15Mitch HartRHPCollege16Jake GodfreyRHPCollege17Patrick MahomesRHPCollege18Nicholas PrattoLHPHS19Nolan (Nonie) WilliamsSSHS20Scott HurstCFCollege21Jacob BukauskasRHPCollege21Carl ChesterCFCollege22Jeren KendallCFCollege23Bennett SousaLHPCollege24C.J. MooreCFCollege25Griffin CanningRHPCollege25Alejandro Toral1BHS26Jordan ButlerLHPHS27Altoon ColemanRHPHS28Ben JordanRHPHS29Kel JohnsonRFCollege30Derek CaseyRHPCollege31Joseph Dunand3BCollege32Mark VientosSSHS33Bryce CarterCCollege34Hunter MilliganLHPHS35Alex LangeRHPCollege35Michael CantuCCollege36Tanner Burns3BHS37Jon LittellOFCollege38Zack ShannonOFCollege39Jeff HardingRHPCollege40Shane BenesOFCollege41Justin SmithCFCollege42Matt RuppenthalRHPCollege43K.J. HarrisonCCollege44Riley A…