#### A project 10+ years in the making

Without a doubt, one of the more common questions we field here is: “Where do you get your data?”

It’s a valid question on a number of fronts. The first comes from a legal perspective. Are we entitled to distribute this data? Does the NFL not hold the rights to data from it’s games? Beyond the legal rights issue, some people are simply wondering how accurate the data is in comparison with official league records.

The best place to start is with the following:

This, my friends, is what the sporting-world refers to as a “play-by-play”. It doesn’t just appear out of thin air. League statisticians from every NFL stadium are tasked with watching plays as they unfold and marking down the details of each and every one. This information then makes it’s way from individual stadiums and within seconds of play completion, can be found on dozens of sites worldwide.

This small snippet of information is all we need to perform our magic. Nothing more, nothing less. A game might feature 160 such snippets. A week might total something in the neighbourhood of 2,500. Numbers aside, it’s what we do with these freely-available snippets of text that really set’s our site apart from the other unofficial sources of NFL data.

Relying on nothing more than play-by-play text means we don’t need to illegally scrape sites for data or rely on any other service to provide us with what we need. While sports leagues have tried to copyright basic written accounts of sporting events, they haven’t had the best of luck. Reporting on the number of times Brett Favre passed to Antonio Freeman in his career based on game accounts is no more of an infringement on copyright than reporting on the number of times a character spoke Harry Potter’s name in a J.K. Rowling book (16,612 if you are interested).

The real question is, how do we get from this:

To this:

```
```{
"data": {
"gid": 3990,
"pid": 651831,
"off": "PIT",
"def": "NE",
"type": "RUSH",
"dseq": 1,
"len": 34,
"qtr": 1,
"min": 7,
"sec": 41,
"ptso": 0,
"ptsd": 0,
"timo": 3,
"timd": 3,
"dwn": 1,
"ytg": 10,
"yfog": 7,
"zone": 1,
"fd": 0,
"sg": 0,
"nh": 0,
"pts": 0,
"tck": [
{
"uid": 430825,
"tck": "GG-0475",
"value": "0.5"
},
{
"uid": 430826,
"tck": "AB-2700",
"value": "0.5"
}
],
"sk": 0,
"pen": 0,
"ints": 0,
"fum": 0,
"saf": 0,
"blk": 0,
"olid": {
"lt": "KB-0750",
"lg": "AV-0350",
"c": "RF-0900",
"rg": "CH-4550",
"rt": "CW-0400"
},
"rush": {
"bc": "DW-3600",
"dir": "LG",
"yds": 6,
"succ": 1,
"kne": 0
}
}
}

And even this:

2016 NFL Database Field Listing

Going from point A (play-by-play text) to points B, C, D and beyond required us to do 2 things:

- Build a ‘virtual’ NFL statistician able to digest those simple play-by-play accounts to create player and team statistics and everything else in-between.
- Hire our own real live ‘Statisticians’ to analyze game tape to fill in the holes and also expand on the basic play-by-play data.

The first task has taken over a decade (of off and on work) and probably in the neighborhood of 15,000 lines of code to achieve. This is not an exaggeration. Here is what’s required to properly parse the effect of Fumbles:

```
```Sub FUMBLES()
If S1.Cells(ROW1, 6) = "PASS" Or S1.Cells(ROW1, 6) = "RUSH" Then
X8 = InStr(X7, BOOK.Cells(X2, 2), "FUMBLES") + 8: X11 = 2
If S1.Cells(ROW1, 26) <> "" Then S1.Cells(ROW1, 61) = S1.Cells(ROW1, 26)
If S1.Cells(ROW1, 35) <> "" And InStr(X7, BOOK.Cells(X2, 2), "FUMBLES") > InStr(X7, BOOK.Cells(X2, 2), "pass") Then S1.Cells(ROW1, 61) = S1.Cells(ROW1, 35)
If InStr(X7, BOOK.Cells(X2, 2), "FUMBLES (Aborted)") > 0 Then
For X3 = 1 To 6
If QBNAME(X3, X6 + 1) = "" Then Exit For
If InStr(Mid(BOOK.Cells(X2, 2), X7, 40), QBNAME(X3, X6 + 1)) > 0 Then S1.Cells(ROW1, 61) = "QB " & QBNAME(X3, X6 + 1): Exit For
Next X3
If S1.Cells(ROW1, 61) = "" Then
For X3 = 1 To 75
If ALLNAME(X3, X6 + 1) = "" Then Exit For
If InStr(Mid(BOOK.Cells(X2, 2), X7, 40), ALLNAME(X3, X6 + 1)) > 0 Then S1.Cells(ROW1, 61) = ALLPOS(X3, X6 + 1) & " " & ALLNAME(X3, X6 + 1): Exit For
Next X3
End If
End If
If InStr(X7, BOOK.Cells(X2, 2), "Aborted") > 0 And InStr(X7, BOOK.Cells(X2, 2), "FUMBLES (Aborted)") = 0 Then
For X3 = 1 To 75
If ALLNAME(X3, X6 + 1) = "" Then Exit For
If InStr(Mid(BOOK.Cells(X2, 2), InStr(X7, BOOK.Cells(X2, 2), "Aborted") + 8, 25), ALLNAME(X3, X6 + 1)) > 0 Then S1.Cells(ROW1, 61) = ALLPOS(X3, X6 + 1) & " " & ALLNAME(X3, X6 + 1): Exit For
Next X3
End If
If InStr(X7, BOOK.Cells(X2, 2), "Lateral to") > 0 And InStr(X7, BOOK.Cells(X2, 2), "FUMBLES") > InStr(X7, BOOK.Cells(X2, 2), "Lateral to") Then
For X3 = 1 To 75
If ALLNAME(X3, X6 + 1) = "" Then Exit For
If InStr(Mid(BOOK.Cells(X2, 2), InStr(X7, BOOK.Cells(X2, 2), "Lateral to") + 11, 25), ALLNAME(X3, X6 + 1)) > 0 Then S1.Cells(ROW1, 61) = ALLPOS(X3, X6 + 1) & " " & ALLNAME(X3, X6 + 1): Exit For
Next X3
End If
If S1.Cells(ROW1, 61) = "" Then S1.Cells(ROW1, 61) = S1.Cells(ROW1, 31)
End If
If S1.Cells(ROW1, 6) = "KOFF" Or S1.Cells(ROW1, 6) = "PUNT" Or S1.Cells(ROW1, 6) = "ONSD" Then
If S1.Cells(ROW1, 6) = "PUNT" Then X11 = 2 Else X11 = 1
If InStr(X7, BOOK.Cells(X2, X11), "MUFFS") > 0 Then
X8 = InStr(X7, BOOK.Cells(X2, X11), "MUFFS") + 6
Else
X8 = InStr(X7, BOOK.Cells(X2, X11), "FUMBLES") + 8
End If
If InStr(X7, BOOK.Cells(X2, X11), "FUMBLES (Aborted)") > 0 Then
If S1.Cells(ROW1, 72) <> "" Then S1.Cells(ROW1, 61) = S1.Cells(ROW1, 72)
If S1.Cells(ROW1, 79) <> "" Then S1.Cells(ROW1, 61) = S1.Cells(ROW1, 79)
End If
If InStr(X7, BOOK.Cells(X2, X11), "Aborted") > 0 And InStr(X7, BOOK.Cells(X2, X11), "FUMBLES (Aborted)") = 0 Then
If S1.Cells(ROW1, 6) = "PUNT" Then X10 = X6 + 1 Else X10 = 2 - X6
For X3 = 1 To 75
If ALLNAME(X3, X10) = "" Then Exit For
If InStr(Mid(BOOK.Cells(X2, X11), InStr(X7, BOOK.Cells(X2, X11), "Aborted") + 8, 25), ALLNAME(X3, X10)) > 0 Then S1.Cells(ROW1, 61) = ALLPOS(X3, X10) & " " & ALLNAME(X3, X10): Exit For
Next X3
End If
If InStr(X7, BOOK.Cells(X2, X11), "Lateral to") > 0 And InStr(X7, BOOK.Cells(X2, X11), "FUMBLES") > InStr(X7, BOOK.Cells(X2, X11), "Lateral to") Then
If S1.Cells(ROW1, 6) = "PUNT" Then X10 = 2 - X6 Else X10 = X6 + 1
For X3 = 1 To 75
If ALLNAME(X3, X10) = "" Then Exit For
If InStr(Mid(BOOK.Cells(X2, X11), InStr(X7, BOOK.Cells(X2, X11), "Lateral to") + 11, 25), ALLNAME(X3, X10)) > 0 Then S1.Cells(ROW1, 61) = ALLPOS(X3, X10) & " " & ALLNAME(X3, X10): Exit For
Next X3
End If
If InStr(X7, BOOK.Cells(X2, X11), "punt is BLOCKED") > 0 And InStr(X7, BOOK.Cells(X2, X11), "FUMBLES") > InStr(X7, BOOK.Cells(X2, X11), "punt is BLOCKED") Then S1.Cells(ROW1, 61) = S1.Cells(ROW1, 67)
If S1.Cells(ROW1, 61) = "" Then
If S1.Cells(ROW1, 6) = "PUNT" Then S1.Cells(ROW1, 61) = S1.Cells(ROW1, 76) Else S1.Cells(ROW1, 61) = S1.Cells(ROW1, 83)
End If
End If
If InStr(X8, BOOK.Cells(X2, X11), "recovers at") > 0 Then S1.Cells(ROW1, 62) = S1.Cells(ROW1, 61)
If InStr(X8, BOOK.Cells(X2, X11), "recovered by") > 0 Then
If S1.Cells(ROW1, 6) = "PUNT" Then X10 = 2 - X6 Else X10 = X6 + 1
For X3 = 1 To 75
If ALLNAME(X3, X10) = "" Then Exit For
If InStr(Mid(BOOK.Cells(X2, X11), InStr(X8, BOOK.Cells(X2, X11), "recovered by") + 13, 25), ALLNAME(X3, X10)) > 0 Then S1.Cells(ROW1, 62) = ALLPOS(X3, X10) & " " & ALLNAME(X3, X10): Exit For
Next X3
End If
If InStr(X8, BOOK.Cells(X2, X11), "RECOVERED by") > 0 Then
If S1.Cells(ROW1, 6) = "PUNT" Then X10 = X6 + 1 Else X10 = 2 - X6
For X3 = 1 To 75
If ALLNAME(X3, X10) = "" Then Exit For
If InStr(Mid(BOOK.Cells(X2, X11), InStr(X8, BOOK.Cells(X2, X11), "RECOVERED by") + 13, 25), ALLNAME(X3, X10)) > 0 Then S1.Cells(ROW1, 62) = ALLPOS(X3, X10) & " " & ALLNAME(X3, X10): Exit For
Next X3
If S1.Cells(ROW1, 62) <> "" Then
X9 = InStr(X7, BOOK.Cells(X2, X11), "RECOVERED by") + 13
If InStr(Mid(BOOK.Cells(X2, X11), X9, 90), "for no gain") + InStr(X9, BOOK.Cells(X2, X11), "Touchback") > 0 Or InStr(Mid(BOOK.Cells(X2, X11), X9, 90), " for ") = 0 Then S1.Cells(ROW1, 63) = 0
If S1.Cells(ROW1, 63) = "" Then
If IsNumeric(Mid(BOOK.Cells(X2, X11), InStr(X9, BOOK.Cells(X2, X11), " for ") + 7, 1)) = True Then S1.Cells(ROW1, 63) = Mid(BOOK.Cells(X2, X11), InStr(X9, BOOK.Cells(X2, X11), " for ") + 5, 3) Else S1.Cells(ROW1, 63) = Mid(BOOK.Cells(X2, X11), InStr(X9, BOOK.Cells(X2, X11), " for ") + 5, 2)
End If
End If
End If
End Sub

Building a customized ‘rules engine’ that produces player and team data with 100% accuracy means accounting for every possible event on a Rush; Pass; Punt; Kickoff; Field Goal; Extra Point or 2pt Conversion — no easy task.

The news is good however: we are now close to 99.9% accuracy on plays from 2000 – 2014 and can say with confidence that we are at 100% for 2015. By the end of the 2015 season, we have plans to be able to mirror official league records with 100% accuracy from 2001 onwards.

You might wonder though: why on Earth would we take the time to build a complex system that can construct player and team statistics from nothing more than play-by-play text?

Firstly, we feel there should be no free lunch. Stealing significant portions of player and team stats from other sites is not something we condone and it’s not a viable business model long-term. The raw play-by-plays we work with would be largely useless to businesses and fantasy football players that need highly organized data in a relational database and this is where our “Sweat of the Brow” comes in.

Secondly, diving down to the play level gives us the flexibility to analyze the data in thousands, if not hundreds of thousands of ways. It’s a level of detail you will simply not find anywhere else.

So, next time you come across a site pushing unofficial data, be sure to ask the important question, “Where do you get your data”.