But then, I realized that in order to do that research I need to perform a lemma research. Just like its mathematical namesake, a lemma research is one that is done for the sake of a bigger one, yet producing a useful result by itself.
So I noticed that I needed the penalty box data. Who was in the penalty box during a power play goal? More specifically, who was responsible for that goal, i.e. who left the penalty box as the result (or had a non-matched 5-minute major penalty during it). Once there was a feed that had penalty box data, but it was only since 2010 or so, and it seems to have become discontinued. Therefore I gathered the game data I already had and just went through the power play goals from 1987/88 through now, and tried to match them with penalties, while weeding out all the cancelling and all the irrelevant (e.g. misconduct) ones.
I am glad to tell that I was able to create a consistent, at least at first look, dataset. But before that I had to go in and correct penalty box entries for about 160 goals manually. About 35 of them were just forced to enter the penalty data manually, because any algorithm assigning the player in the box to the goal would be ambiguous. However I also discovered about 125 goals (120 pre 1999/00, when extra reports were introduced, and only five since) that should not even be marked as power play goals. There was no matching penalty. Of course, the mistake can be on the penalty data in the NHL report: the time of the penalty may be reported wrongly. But until further notice, these goals should not be considered PPG:
| GameID | P | Time | Scorer | Team |
|---|---|---|---|---|
| 198720125 | 3 | 9:19 | BOB SWEENEY | Boston Bruins |
| 198720134 | 3 | 18:58 | RICK TOCCHET | Philadelphia Flyers |
| 198720239 | 1 | 1:23 | STEPHANE RICHER | Montreal Canadiens |
| 198720367 | 1 | 4:51 | DALE HAWERCHUK | Winnipeg Jets |
| 198720388 | 1 | 17:46 | TROY MURRAY | Chicago Blackhawks |
| 198720389 | 3 | 3:55 | PAUL MACLEAN | Winnipeg Jets |
| 198720431 | 2 | 6:56 | PETER TAGLIANETTI | Winnipeg Jets |
| 198720449 | 2 | 12:34 | MIKKO MAKELA | New York Islanders |
| 198720471 | 3 | 10:51 | ANTON STASTNY | Quebec Nordiques |
| 198720484 | 2 | 13:38 | MARIO LEMIEUX | Pittsburgh Penguins |
| 198720528 | 1 | 6:32 | CHARLIE SIMMER | Pittsburgh Penguins |
| 198720610 | 3 | 3:08 | LAURIE BOSCHMAN | Winnipeg Jets |
| 198720735 | 3 | 8:10 | MIKE FOLIGNO | Buffalo Sabres |
| 198720755 | 1 | 3:06 | GARRY GALLEY | Washington Capitals |
| 198720755 | 2 | 0:29 | GERALD DIDUCK | New York Islanders |
| 198720787 | 1 | 17:02 | AARON BROTEN | New Jersey Devils |
| 198720799 | 2 | 0:49 | JIMMY CARSON | Los Angeles Kings |
| 198720802 | 2 | 3:24 | MIKE FOLIGNO | Buffalo Sabres |
| 198720804 | 1 | 18:03 | PAT VERBEEK | New Jersey Devils |
| 198730134 | 1 | 7:52 | BRUCE DRIVER | New Jersey Devils |
| 198730223 | 3 | 9:47 | MARK JOHNSON | New Jersey Devils |
| 198730314 | 2 | 12:31 | CAM NEELY | Boston Bruins |
| 198820088 | 2 | 6:17 | RANDY MOLLER | Quebec Nordiques |
| 198820088 | 2 | 7:11 | ANTON STASTNY | Quebec Nordiques |
| 198820147 | 1 | 15:58 | JOHN CULLEN | Pittsburgh Penguins |
| 198820150 | 2 | 2:29 | KEVIN DINEEN | Hartford Whalers |
| 198820203 | 3 | 12:45 | JOE MULLEN | Calgary Flames |
| 198820241 | 2 | 18:53 | DAN QUINN | Pittsburgh Penguins |
| 198820307 | 3 | 10:12 | MARIO LEMIEUX | Pittsburgh Penguins |
| 198820318 | 2 | 5:24 | GAETAN DUCHESNE | Quebec Nordiques |
| 198820331 | 3 | 7:36 | PAUL GAGNE | Toronto Maple Leafs |
| 198820489 | 1 | 16:20 | DALE HUNTER | Washington Capitals |
| 198820542 | 1 | 18:13 | DOUG EVANS | St. Louis Blues |
| 198820727 | 3 | 7:49 | PAUL MACLEAN | Detroit Red Wings |
| 198820803 | 2 | 6:58 | DOUG SMITH | Vancouver Canucks |
| 198820821 | 3 | 17:43 | BRENT FEDYK | Detroit Red Wings |
| 198920146 | 1 | 5:14 | KEVIN DINEEN | Hartford Whalers |
| 198920158 | 1 | 5:26 | TROY MURRAY | Chicago Blackhawks |
| 198920220 | 2 | 15:53 | NEAL BROTEN | Minnesota North Stars |
| 198920238 | 1 | 2:39 | GREG PASLAWSKI | Winnipeg Jets |
| 198920303 | 2 | 4:55 | PAT ELYNUIK | Winnipeg Jets |
| 198920475 | 3 | 8:25 | BRIAN MULLEN | New York Rangers |
| 198920543 | 3 | 18:46 | AL MACINNIS | Calgary Flames |
| 198920667 | 1 | 3:04 | JEREMY ROENICK | Chicago Blackhawks |
| 198920749 | 1 | 8:18 | CRAIG JANNEY | Boston Bruins |
| 198920818 | 2 | 1:25 | JOHN OGRODNICK | New York Rangers |
| 198930231 | 2 | 13:43 | TRENT YAWNEY | Chicago Blackhawks |
| 198930322 | 2 | 18:01 | JARI KURRI | Edmonton Oilers |
| 199020005 | 3 | 19:54 | RAY SHEPPARD | New York Rangers |
| 199020056 | 1 | 15:44 | DAVE TAYLOR | Los Angeles Kings |
| 199020262 | 2 | 11:20 | BOBBY HOLIK | Hartford Whalers |
| 199020612 | 3 | 7:18 | JOHN CHABOT | Detroit Red Wings |
| 199020636 | 1 | 15:02 | BRIAN LEETCH | New York Rangers |
| 199020647 | 2 | 9:16 | KENNETH JR HODGE | Boston Bruins |
| 199020704 | 2 | 12:47 | KELLY KISIO | New York Rangers |
| 199020716 | 3 | 0:34 | JOE SAKIC | Quebec Nordiques |
| 199020762 | 2 | 5:16 | MARK RECCHI | Pittsburgh Penguins |
| 199020815 | 2 | 19:28 | KEVIN STEVENS | Pittsburgh Penguins |
| 199030222 | 3 | 2:17 | DINO CICCARELLI | Washington Capitals |
| 199030235 | 3 | 14:04 | BRIAN PROPP | Minnesota North Stars |
| 199120059 | 3 | 2:20 | DOUG GILMOUR | Calgary Flames |
| 199120070 | 2 | 10:26 | DAVE GAGNER | Minnesota North Stars |
| 199120093 | 3 | 18:48 | DARREN TURCOTTE | New York Rangers |
| 199120238 | 3 | 0:18 | PAUL RANHEIM | Calgary Flames |
| 199120313 | 3 | 11:52 | JEREMY ROENICK | Chicago Blackhawks |
| 199120407 | 1 | 10:39 | BOBBY CARPENTER | Boston Bruins |
| 199120504 | 2 | 18:42 | JIMMY CARSON | Detroit Red Wings |
| 199120617 | 2 | 16:43 | MARTY MCSORLEY | Los Angeles Kings |
| 199120625 | 3 | 18:17 | TODD ELIK | Minnesota North Stars |
| 199120638 | 1 | 13:15 | GREG ADAMS | Vancouver Canucks |
| 199120755 | 3 | 10:48 | DOUG GILMOUR | Toronto Maple Leafs |
| 199130143 | 3 | 13:57 | AL IAFRATE | Washington Capitals |
| 199220002 | 2 | 5:17 | SCOTT STEVENS | New Jersey Devils |
| 199220013 | 1 | 12:08 | RICK TOCCHET | Pittsburgh Penguins |
| 199220023 | 2 | 17:32 | MARIO LEMIEUX | Pittsburgh Penguins |
| 199220068 | 2 | 17:22 | MIKE GARTNER | New York Rangers |
| 199220091 | 3 | 19:34 | JOE JUNEAU | Boston Bruins |
| 199220121 | 1 | 6:14 | MIKE GARTNER | New York Rangers |
| 199220149 | 2 | 18:44 | CHRIS KONTOS | Tampa Bay Lightning |
| 199220181 | 3 | 6:21 | ULF DAHLEN | Minnesota North Stars |
| 199220287 | 1 | 16:56 | CHRIS KONTOS | Tampa Bay Lightning |
| 199220337 | 2 | 5:42 | ALEXANDER MOGILNY | Buffalo Sabres |
| 199220388 | 1 | 15:45 | GREG HAWGOOD | Edmonton Oilers |
| 199220401 | 2 | 12:48 | JEFF NORTON | New York Islanders |
| 199220562 | 3 | 9:19 | CHRIS KONTOS | Tampa Bay Lightning |
| 199220563 | 1 | 9:25 | TEPPO NUMMINEN | Winnipeg Jets |
| 199220589 | 3 | 9:18 | ROD BRIND'AMOUR | Philadelphia Flyers |
| 199220595 | 1 | 7:20 | CRAIG JANNEY | St. Louis Blues |
| 199220908 | 2 | 16:28 | VALERI KAMENSKY | Quebec Nordiques |
| 199220986 | 1 | 15:44 | JIRI SLEGR | Vancouver Canucks |
| 199320065 | 1 | 15:37 | DENIS SAVARD | Tampa Bay Lightning |
| 199320092 | 3 | 11:22 | SERGEI FEDOROV | Detroit Red Wings |
| 199320636 | 1 | 16:40 | TIM SWEENEY | Mighty Ducks Of Anaheim |
| 199320643 | 3 | 16:50 | MARTIN LAPOINTE | Detroit Red Wings |
| 199320740 | 2 | 7:53 | KEITH TKACHUK | Winnipeg Jets |
| 199320840 | 1 | 17:17 | SERGEI ZUBOV | New York Rangers |
| 199320905 | 3 | 18:16 | KEVIN STEVENS | Pittsburgh Penguins |
| 199420025 | 2 | 1:32 | KELLY BUCHBERGER | Edmonton Oilers |
| 199420072 | 2 | 7:27 | STEVE THOMAS | New York Islanders |
| 199420087 | 1 | 9:52 | KEITH TKACHUK | Winnipeg Jets |
| 199420332 | 2 | 2:35 | GRANT LEDYARD | Dallas Stars |
| 199420332 | 2 | 7:11 | RAY SHEPPARD | Detroit Red Wings |
| 199520189 | 2 | 15:41 | LUC ROBITAILLE | New York Rangers |
| 199520226 | 3 | 17:34 | CHRIS GRATTON | Tampa Bay Lightning |
| 199520490 | 2 | 9:41 | TODD BERTUZZI | New York Islanders |
| 199520539 | 3 | 13:25 | MARK MESSIER | New York Rangers |
| 199520560 | 1 | 9:03 | VYACHESLAV KOZLOV | Detroit Red Wings |
| 199520694 | 3 | 15:43 | RON FRANCIS | Pittsburgh Penguins |
| 199520744 | 2 | 6:41 | SCOTT MELLANBY | Florida Panthers |
| 199520750 | 2 | 9:05 | NICKLAS LIDSTROM | Detroit Red Wings |
| 199520766 | 1 | 16:00 | BENOIT HOGUE | Dallas Stars |
| 199520776 | 2 | 5:53 | MARIO LEMIEUX | Pittsburgh Penguins |
| 199520809 | 1 | 12:47 | ADAM GRAVES | New York Rangers |
| 199520847 | 2 | 16:40 | KEITH PRIMEAU | Detroit Red Wings |
| 199620127 | 3 | 12:03 | ALEXEI ZHAMNOV | Chicago Blackhawks |
| 199620211 | 2 | 13:08 | GREG ADAMS | Dallas Stars |
| 199620466 | 3 | 14:50 | JOZEF STUMPEL | Boston Bruins |
| 199620792 | 1 | 11:50 | BRENDAN SHANAHAN | Detroit Red Wings |
| 199621058 | 2 | 1:41 | MARTIN GELINAS | Vancouver Canucks |
| 199720028 | 2 | 18:01 | TREVOR LINDEN | Vancouver Canucks |
| 199720067 | 3 | 16:29 | TERRY YAKE | St. Louis Blues |
| 199920756 | 1 | 6:46 | JAMIE LANGENBRUNNER | Dallas Stars |
| 200520486 | 1 | 17:28 | ROB COLLINS | New York Islanders |
| 200620150 | 1 | 7:59 | NATHAN HORTON | Florida Panthers |
| 200620627 | 1 | 5:00 | RYANE CLOWE | San Jose Sharks |
| 200821010 | 1 | 16:44 | MIKAEL SAMUELSSON | Detroit Red Wings |
| 201620276 | 2 | 12:03 | JOHAN LARSSON | Buffalo Sabres |
The resulting penalty box data is available on our website, in the Request Analysis section.
Hopefully, tomorrow, I'll blog about another useful dataset the lemma research has produced.
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