我正在尝试创建一个新专栏，其中包含美国第 1 级大学橄榄球主教练在每个会议中最早的第一个赛季。
例如，美国会议的所有“最长任期”列值为“2007”，而对于 ACC，则为“2008”，依此类推。
一旦问题得到解决，我将如何在 R 中实现它？有没有办法在 dplyr 包中实现？
School,Conference,Head coach,First season,Current W,Current L,Current W%,Career W,Career L,Career W%,Offensive coordinator(s),Defensive coordinator(s),Special Teams coordinator(s)
Cincinnati Bearcats,The American,Luke Fickell,2017,35,14,0.71399999999999997,41,21,0.66100000000000003,Mike Denbrock,Mike Tressel,Brian Mason
East Carolina Pirates,The American,Mike Houston,2019,7,14,0.33300000000000002,7,14,0.33300000000000002,Donnie Kirkpatrick,Blake Harrell,Tim Daoust
Houston Cougars,The American,Dana Holgorsen,2019,7,13,0.35,68,54,0.55700000000000005,Shannon Dawson,Doug Belk,Mark Scott
Memphis Tigers,The American,Ryan Silverfield,2020,8,4,0.66700000000000004,8,4,0.66700000000000004,Kevin Johns,Mike MacIntyre,Vacant
Navy Midshipmen,The American,Ken Niumatalolo,2007,101,67,0.60099999999999998,101,67,0.60099999999999998,Ivin Jasper,Brian Newberry,Danny O'Rourke
SMU Mustangs,The American,Sonny Dykes,2018,22,14,0.61099999999999999,63,59,0.51600000000000001,Garrett Riley,Jim Leavitt,Chris Brasfield
South Florida Bulls,The American,Jeff Scott,2020,1,8,0.111,1,8,0.111,Charlie Weis Jr.,Glenn Spencer,Daniel Da Prato
Temple Owls,The American,Rod Carey,2019,9,11,0.45,61,41,0.59799999999999998,Mike Uremovich,Jeff Knowles,Brett Diersen
Tulane Green Wave,The American,Willie Fritz,2016,29,33,0.46800000000000003,46,40,0.53500000000000003,Chip Long,Chris Hampton,Willie Fritz
Tulsa Golden Hurricane,The American,Philip Montgomery,2015,31,40,0.437,31,40,0.437,Philip Montgomery,Joseph Gillespie,Calvin Lowry
UCF Knights,The American,Gus Malzahn,2021,0,0,–,77,38,0.67,Tim Harris Jr. / G. J. Kinne,David Gibbs / Travis Williams,Brian Blackmon
Boston College Eagles,ACC,Jeff Hafley,2020,6,5,0.54500000000000004,6,5,0.54500000000000004,Frank Cignetti Jr.,Tem Lukabu,Matt Thurin
Clemson Tigers,ACC,Dabo Swinney,2008,140,33,0.80900000000000005,140,33,0.80900000000000005,Tony Elliott,Brent Venables,Mickey Conn
Duke Blue Devils,ACC,David Cutcliffe,2008,74,88,0.45700000000000002,118,117,0.502,Re'Quan Boyette / Jeff Faris,Ben Albert / Matt Guerrieri,Kirk Benedict
Florida State Seminoles,ACC,Mike Norvell,2020,3,6,0.33300000000000002,41,21,0.66100000000000003,Kenny Dillingham,Adam Fuller,John Papuchis
Georgia Tech Yellow Jackets,ACC,Geoff Collins,2019,6,16,0.27300000000000002,21,26,0.44700000000000001,Dave Patenaude,Nathan Burton / Andrew Thacker,Jeff Popovich / Chris Wiesehan
Louisville Cardinals,ACC,Scott Satterfield,2019,12,13,0.48,59,29,0.67,Vacant,Bryan Brown / Cort Dennison,Stu Holt
Miami Hurricanes,ACC,Manny Diaz,2019,14,10,0.58299999999999996,14,10,0.58299999999999996,Rhett Lashlee,Manny Diaz,Jonathan Patke
North Carolina Tar Heels,ACC,Mack Brown,2019[N 1],15,10,0.6,259,132,0.66200000000000003,Phil Longo,Jay Bateman / Tommy Thigpen,Jovan Dewitt
NC State Wolfpack,ACC,Dave Doeren,2013,55,46,0.54500000000000004,78,50,0.60899999999999999,Tim Beck,Tony Gibson,Todd Goebbel
Pittsburgh Panthers,ACC,Pat Narduzzi,2015,42,34,0.55300000000000005,42,34,0.55300000000000005,Mark Whipple,Randy Bates,Andre Powell
Syracuse Orange,ACC,Dino Babers,2016,24,36,0.4,42,45,0.48299999999999998,Sterlin Gilbert,Tony White,Vacant
Virginia Cavaliers,ACC,Bronco Mendenhall,2016,30,32,0.48399999999999999,129,75,0.63200000000000001,Robert Anae,Nick Howell / Kelly Poppinga,Ricky Brumfield
Virginia Tech Hokies,ACC,Justin Fuente,2016,38,26,0.59399999999999997,64,49,0.56599999999999995,Brad Cornelsen,Justin Hamilton,James Shibest
Wake Forest Demon Deacons,ACC,Dave Clawson,2014,40,45,0.47099999999999997,72,76,0.48599999999999999,Warren Ruggiero,Lyle Hemphill,Wayne Lineburg
Baylor Bears,Big 12,Dave Aranda,2020,2,7,0.222,2,7,0.222,Jeff Grimes,Ron Roberts,Matt Powledge
Iowa State Cyclones,Big 12,Matt Campbell,2016,35,28,0.55600000000000005,70,43,0.61899999999999999,Tom Manning,Jon Heacock,Vacant
Kansas Jayhawks,Big 12,Emmett Jones,2021,0,0,–,0,0,–,Mike DeBord,DJ Eliot,Jacob Schoonover
Kansas State Wildcats,Big 12,Chris Klieman,2019,12,11,0.52200000000000002,12,11,0.52200000000000002,Courtney Messingham,Joe Klanderman,Vacant
Oklahoma Sooners,Big 12,Lincoln Riley,2017,45,8,0.84899999999999998,45,8,0.84899999999999998,Bill Bedenbaugh / Cale Gundy,Alex Grinch,Joe Jon Finley
Oklahoma State Cowboys,Big 12,Mike Gundy,2005,137,67,0.67200000000000004,137,67,0.67200000000000004,Kasey Dunn,Jim Knowles,John Wozniak
TCU Horned Frogs,Big 12,Gary Patterson,2000,178,74,0.70599999999999996,178,74,0.70599999999999996,Doug Meacham,Chad Glasgow,Dan Sharp
Texas Longhorns,Big 12,Steve Sarkisian,2021,0,0,–,46,35,0.56799999999999995,Kyle Flood,Jeff Choate / Pete Kwiatkowski,Jeff Banks
Texas Tech Red Raiders,Big 12,Matt Wells,2019,8,14,0.36399999999999999,52,48,0.52,Sonny Cumbie,Keith Patterson,Mark Tommerdahl
West Virginia Mountaineers,Big 12,Neal Brown,2019,11,11,0.5,46,27,0.63,Gerad Parker,ShaDon Brown / Jordan Lesley,Jeff Koonz
Illinois Fighting Illini,Big Ten,Bret Bielema,2021,0,0,–,97,58,0.626,Tony Petersen,Ryan Walters,Ben Miller
Indiana Hoosiers,Big Ten,Tom Allen,2017,24,22,0.52200000000000002,24,22,0.52200000000000002,Grant Heard / Nick Sheridan,Charlton Warren,Kasey Teegardin
Iowa Hawkeyes,Big Ten,Kirk Ferentz,1999,168,106,0.61299999999999999,168,106,0.61299999999999999,Brian Ferentz,Phil Parker,LeVar Woods
Maryland Terrapins,Big Ten,Mike Locksley,2019,6,17,0.26100000000000001,8,43,0.157,Dan Enos,Brian Stewart / Brian Williams,Ron Zook
Michigan Wolverines,Big Ten,Jim Harbaugh,2015,49,22,0.69,78,43,0.64500000000000002,Josh Gattis / Sherrone Moore,Maurice Linguist / Mike Macdonald,Jay Harbaugh
Michigan State Spartans,Big Ten,Mel Tucker,2020,2,5,0.28599999999999998,7,12,0.36799999999999999,Jay Johnson,Scottie Hazelton,Ross Els
Minnesota Golden Gophers,Big Ten,P. J. Fleck,2017,26,19,0.57799999999999996,56,41,0.57699999999999996,Mike Sanford Jr. / Matt Simon,Joe Harasymiak / Joe Rossi,Rob Wenger
Nebraska Cornhuskers,Big Ten,Scott Frost,2018,12,20,0.375,31,27,0.53400000000000003,Matt Lubick,Erik Chinander,Vacant
Northwestern Wildcats,Big Ten,Pat Fitzgerald,2006,106,81,0.56699999999999995,106,81,0.56699999999999995,Mike Bajakian,Jim O'Neil,Jeff Genyk
Ohio State Buckeyes,Big Ten,Ryan Day,2019,23,2,0.92,23,2,0.92,Kevin Wilson,Kerry Coombs,Parker Fleming
Penn State Nittany Lions,Big Ten,James Franklin,2014,60,28,0.68200000000000005,84,43,0.66100000000000003,Mike Yurcich,Brent Pry / Anthony Poindexter,Joe Lorig
Purdue Boilermakers,Big Ten,Jeff Brohm,2017,19,25,0.432,48,35,0.57799999999999996,Brian Brohm / JaMarcus Shephard,Brad Lambert,Marty Biagi
Rutgers Scarlet Knights,Big Ten,Greg Schiano,2020[N 2],3,6,0.33300000000000002,71,73,0.49299999999999999,Sean Gleeson,Robb Smith,Adam Scheier
Wisconsin Badgers,Big Ten,Paul Chryst,2015,56,19,0.747,75,38,0.66400000000000003,Joe Rudolph,Jim Leonhard,Chris Haering
Charlotte 49ers,C-USA,Will Healy,2019,9,10,0.47399999999999998,9,10,0.47399999999999998,Mark Carney,Brandon Cooper / Marcus West,Max Thurmond
Florida Atlantic Owls,C-USA,Willie Taggart,2020,5,4,0.55600000000000005,61,66,0.48,Mike Johnson,Mike Stoops,Raymond Woodie
Florida International Panthers,C-USA,Butch Davis,2017,23,21,0.52300000000000002,86,64,0.57299999999999995,Andrew Breiner,Everett Withers,Casey Horny
Louisiana Tech Bulldogs,C-USA,Skip Holtz,2013,61,41,0.59799999999999998,115,89,0.56399999999999995,Joe Sloan,David Blackwell,Dennis Smith
Marshall Thundering Herd,C-USA,Charles Huff,2021,0,0,–,0,0,–,Tim Cramsey,Lance Guidry,Jeremy Springer
Middle Tennessee Blue Raiders,C-USA,Rick Stockstill,2006,94,92,0.505,94,92,0.505,Brent Dearmon,Scott Shafer,Mike Polly
North Texas Mean Green,C-USA,Seth Littrell,2016,31,31,0.5,31,31,0.5,Mike Bloesch / Tommy Mainord,Phil Bennett,Chris Petrilli
Old Dominion Monarchs,C-USA,Ricky Rahne,2020,0,0,–,0,0,–,Kirk Campbell,Blake Seiler,Kevin Smith
Rice Owls,C-USA,Mike Bloomgren,2018,7,23,0.23300000000000001,7,23,0.23300000000000001,Marques Tuiasosopo,Brian Smith,Vacant
Southern Miss Golden Eagles,C-USA,Will Hall,2021,0,0,–,0,0,–,Cayden Cochran,Austin Armstrong,Greg Meyer
UAB Blazers,C-USA,Bill Clark,2014[N 3],40,22,0.64500000000000002,40,22,0.64500000000000002,Bryant Vincent,David Reeves,Heath Thomas
UTEP Miners,C-USA,Dana Dimel,2018,5,27,0.156,35,66,0.34699999999999998,Dave Warner,Bradley Dale Peveto,Joe Robinson
UTSA Roadrunners,C-USA,Jeff Traylor,2020,7,5,0.58299999999999996,7,5,0.58299999999999996,Barry Lunney Jr.,Jess Loepp / Rod Wright,Tommy Perry
Western Kentucky Hilltoppers,C-USA,Tyson Helton,2019,14,11,0.56000000000000005,14,11,0.56000000000000005,Zach Kittley,Maurice Crum Jr.,Andy LaRussa
Army Black Knights,Independent,Jeff Monken,2014,49,39,0.55700000000000005,49,39,0.55700000000000005,Brent Davis,Nate Woody,Sean Saturnio
BYU Cougars,Independent,Kalani Sitake,2016,38,26,0.59399999999999997,38,26,0.59399999999999997,Aaron Roderick,Ilaisa Tuiaki,Ed Lamb
Liberty Flames,Independent,Hugh Freeze,2019,18,6,0.75,67,33,0.67,Kent Austin / Maurice Harris,Scott Symons,Tanner Burns
New Mexico State Aggies,Independent,Doug Martin,2013,22,64,0.25600000000000001,51,117,0.30399999999999999,Doug Martin,Frank Spaziani,Matt Christian / Ronnie Pentz
Notre Dame Fighting Irish,Independent,Brian Kelly,2010,81,38,0.68100000000000005,135,60,0.69199999999999995,Tommy Rees,Marcus Freeman,Brian Polian
UConn Huskies,Independent,Randy Edsall,2017[N 4],6,30,0.16700000000000001,98,127,0.436,Frank Giufre,Lou Spanos,Eddie Allen
UMass Minutemen,Independent,Walt Bell,2019,1,15,6.3E-2,1,15,6.3E-2,Angelo Mirando,Tommy Restivo,Luke Paschall
Akron Zips,MAC,Tom Arth,2019,1,17,5.6000000000000001E-2,1,17,5.6000000000000001E-2,Tommy Zagorski,Matt Feeney,Chris Hurd
Ball State Cardinals,MAC,Mike Neu,2016,22,34,0.39300000000000002,22,34,0.39300000000000002,Kevin Lynch,Tyler Stockton,Patrick Dougherty
Bowling Green Falcons,MAC,Scot Loeffler,2019,3,14,0.17599999999999999,3,14,0.17599999999999999,Terry Malone,Eric Lewis,Bob Ligashesky
Buffalo Bulls,MAC,Lance Leipold,2015,37,33,0.52900000000000003,37,33,0.52900000000000003,Andy Kotelnicki / Jim Zebrowski,Brian Borland,Taiwo Onatolu
Central Michigan Chippewas,MAC,Jim McElwain,2019,11,9,0.55000000000000004,55,37,0.59799999999999998,Kevin Barbay,Robb Akey,Keith Murphy
Eastern Michigan Eagles,MAC,Chris Creighton,2014,30,51,0.37,30,51,0.37,Chris Creighton,Neal Neathery,Jay Nunez
Kent State Golden Flashes,MAC,Sean Lewis,2018,12,17,0.41399999999999998,12,17,0.41399999999999998,Andrew Sowder,Tom Kaufman,Zac Barton
Miami RedHawks,MAC,Chuck Martin,2014,32,46,0.41,32,46,0.41,Eric Koehler,John Hauser / Spence Nowinsky,Doug Shearer
Northern Illinois Huskies,MAC,Thomas Hammock,2019,5,13,0.27800000000000002,5,13,0.27800000000000002,Eric Eidsness,Derrick Jackson,Dan Jackson / Aaron Wilkins
Ohio Bobcats,MAC,Frank Solich,2005,115,82,0.58399999999999996,173,101,0.63100000000000001,Tim Albin,Ron Collins / Pete Germano,Nate Faanes
Toledo Rockets,MAC,Jason Candle,2016,38,21,0.64400000000000002,38,21,0.64400000000000002,Mike Hallett / Robert Weiner,Vince Kehres / Craig Kuligowski,Ross Watson
Western Michigan Broncos,MAC,Tim Lester,2017,24,20,0.54500000000000004,24,20,0.54500000000000004,Vacant,Lou Esposito,David Denham / Joe Palcic
Air Force Falcons,Mountain West,Troy Calhoun,2007,102,72,0.58599999999999997,102,72,0.58599999999999997,Mike Thiessen,John Rudzinski,Tim Horton
Boise State Broncos,Mountain West,Andy Avalos,2021,0,0,–,0,0,–,Tim Plough,Spencer Danielson / Kane Ioane,Stacy Collins
Colorado State Rams,Mountain West,Steve Addazio,2020,1,3,0.25,58,58,0.5,Jon Budmayr,Chuck Heater,Vacant
Fresno State Bulldogs,Mountain West,Kalen DeBoer,2020,3,3,0.5,3,3,0.5,Ryan Grubb,William Inge,Eric Schmidt
Hawaiʻi Rainbow Warriors,Mountain West,Todd Graham,2020,5,4,0.55600000000000005,100,65,0.60599999999999998,Bo Graham,Victor Santa Cruz / Jacob Yoro,Dan Phillips
Nevada Wolf Pack,Mountain West,Jay Norvell,2017,25,22,0.53200000000000003,25,22,0.53200000000000003,Matt Mumme,Brian Ward,Thomas Sheffield
New Mexico Lobos,Mountain West,Danny Gonzales,2020,2,5,0.28599999999999998,2,5,0.28599999999999998,Drew Mehringer / Derek Warehime,Rocky Long,Jamie Christian
San Diego State Aztecs,Mountain West,Brady Hoke,2020,4,4,0.5,82,76,0.51900000000000002,Jeff Hecklinski,Kurt Mattix,Doug Deakin
San José State Spartans,Mountain West,Brent Brennan,2017,15,30,0.33300000000000002,15,30,0.33300000000000002,Kevin McGiven,Derrick Odum,Scott White
UNLV Rebels,Mountain West,Marcus Arroyo,2020,0,6,0,0,6,0,Glenn Thomas,Peter Hansen,Vacant
Utah State Aggies,Mountain West,Blake Anderson,2021,0,0,–,51,37,0.57999999999999996,Anthony Tucker,Ephraim Banda,Nick Paremski
Wyoming Cowboys,Mountain West,Craig Bohl,2014,38,44,0.46300000000000002,38,44,0.46300000000000002,Tim Polasek,Jay Sawvel,Shannon Moore
Arizona Wildcats,Pac-12,Jedd Fisch,2021,0,0,–,1,1,0.5,Brennan Carroll,Don Brown,Keith Dudzinski
Arizona State Sun Devils,Pac-12,Herm Edwards,2018,17,13,0.56699999999999995,17,13,0.56699999999999995,Zak Hill,Antonio Pierce,Shawn Slocum
California Golden Bears,Pac-12,Justin Wilcox,2017,21,21,0.5,21,21,0.5,Bill Musgrave,Peter Sirmon,Charlie Ragle
Colorado Buffaloes,Pac-12,Karl Dorrell,2020,4,2,0.66700000000000004,39,29,0.57399999999999995,Darrin Chiaverini,Chris Wilson,Vacant
Oregon Ducks,Pac-12,Mario Cristobal,2018,25,10,0.71399999999999997,52,57,0.47699999999999998,Joe Moorhead,Tim DeRuyter,Bobby Williams
Oregon State Beavers,Pac-12,Jonathan Smith,2018,9,22,0.28999999999999998,9,22,0.28999999999999998,Brian Lindgren,Tim Tibesar,Jake Cookus
Stanford Cardinal,Pac-12,David Shaw,2011,90,36,0.71399999999999997,90,36,0.71399999999999997,Tavita Pritchard,Lance Anderson,Pete Alamar
UCLA Bruins,Pac-12,Chip Kelly,2018,10,21,0.32300000000000001,56,28,0.66700000000000004,Justin Frye,Jerry Azzinaro,Derek Sage
USC Trojans,Pac-12,Clay Helton,2015,45,23,0.66200000000000003,45,23,0.66200000000000003,Graham Harrell,Todd Orlando,Sean Snyder
Utah Utes,Pac-12,Kyle Whittingham,2005,134,66,0.67,134,66,0.67,Andy Ludwig,Morgan Scalley,Sharrieff Shah
Washington Huskies,Pac-12,Jimmy Lake,2020,3,1,0.75,3,1,0.75,John Donovan,Bob Gregory / Ikaika Malloe,Keith Bhonapha
Washington State Cougars,Pac-12,Nick Rolovich,2020,1,3,0.25,29,29,0.5,Brian Smith / Craig Stutzmann,Jake Dickert,Kyle Krantz
Alabama Crimson Tide,SEC,Nick Saban,2007,164,23,0.877,255,65,0.79700000000000004,Bill O'Brien,Pete Golding,Drew Svoboda
Arkansas Razorbacks,SEC,Sam Pittman,2020,3,7,0.3,3,7,0.3,Kendal Briles,Barry Odom,Scott Fountain
Auburn Tigers,SEC,Bryan Harsin,2021,0,0,–,76,24,0.76,Mike Bobo,Derek Mason,Bert Watts
Florida Gators,SEC,Dan Mullen,2018,29,9,0.76300000000000001,98,55,0.64100000000000001,Vacant,Todd Grantham,Greg Knox
Georgia Bulldogs,SEC,Kirby Smart,2016,52,13,0.8,52,13,0.8,Todd Monken,Dan Lanning / Glenn Schumann,Scott Cochran
Kentucky Wildcats,SEC,Mark Stoops,2013,49,50,0.495,49,50,0.495,Liam Coen,Brad White,Louie Matsakis
LSU Tigers,SEC,Ed Orgeron,2016,45,14,0.76300000000000001,62,41,0.60199999999999998,Jake Peetz,Daronte Jones,Greg McMahon
Ole Miss Rebels,SEC,Lane Kiffin,2020,5,5,0.5,66,39,0.629,Jeff Lebby,D. J. Durkin / Chris Partridge,Coleman Hutzler
Mississippi State Bulldogs,SEC,Mike Leach,2020,4,7,0.36399999999999999,143,97,0.59599999999999997,Mike Leach,Zach Arnett,Matt Brock
Missouri Tigers,SEC,Eliah Drinkwitz,2020,5,5,0.5,17,6,0.73899999999999999,Eliah Drinkwitz / Curtis Luper,Steve Wilks,Erik Link
South Carolina Gamecocks,SEC,Shane Beamer,2021,0,0,–,0,0,–,Marcus Satterfield,Clayton White,Pete Lembo
Tennessee Volunteers,SEC,Josh Heupel,2021,0,0,–,28,8,0.77800000000000002,Alex Golesh,Tim Banks,Mike Ekeler
Texas A&M Aggies,SEC,Jimbo Fisher,2018,26,10,0.72199999999999998,109,33,0.76800000000000002,Darrell Dickey,Mike Elko,Vacant
Vanderbilt Commodores,SEC,Clark Lea,2021,0,0,–,0,0,–,David Raih,Jesse Minter,Justin Lustig
Appalachian State Mountaineers,Sun Belt,Shawn Clark,2020,10,3,0.76900000000000002,10,3,0.76900000000000002,Frank Ponce,Dale Jones,Brian Haines
Arkansas State Red Wolves,Sun Belt,Butch Jones,2021,0,0,–,84,54,0.60899999999999999,Keith Heckendorf,Rob Harley,Steve Hauser
Coastal Carolina Chanticleers,Sun Belt,Jamey Chadwell,2019,19,17,0.52800000000000002,19,17,0.52800000000000002,Newland Isaac / Willy Korn,Chad Staggs,Curt Baldus
Georgia Southern Eagles,Sun Belt,Chad Lunsford,2018,27,18,0.6,27,18,0.6,Doug Ruse,Scot Sloan,Joe Graves
Georgia State Panthers,Sun Belt,Shawn Elliott,2017,22,25,0.46800000000000003,23,30,0.434,Brad Glenn,Nick Fuqua,Shiel Wood
Louisiana Ragin' Cajuns,Sun Belt,Billy Napier,2018,28,11,0.71799999999999997,28,11,0.71799999999999997,Michael Desormeaux / Tim Leger,Patrick Toney,Chris Couch
Louisiana-Monroe Warhawks,Sun Belt,Terry Bowden,2021,0,0,–,82,69,0.54300000000000004,Rich Rodriguez,Zac Alley,Ron West
South Alabama Jaguars,Sun Belt,Kane Wommack,2021,0,0,–,0,0,–,Major Applewhite,Corey Batoon,Jamael Lett
Texas State Bobcats,Sun Belt,Jake Spavital,2019,5,19,0.20799999999999999,5,19,0.20799999999999999,Jacob Peeler,Brian Gambel / Zac Spavital,Nick Whitworth
Troy Trojans,Sun Belt,Chip Lindsey,2019,10,13,0.435,10,13,0.435,Luke Meadows,Brandon Hall,Dayne Brown
非常感谢任何帮助。
答案 0 :(得分：0)
导入数据框（使用 read_csv）后执行此操作的最简单方法是将最小函数应用于第一季列中的年份。
dplyr::mutate 是一个允许输入分组数据的函数，因此我们可以在此列中找到每组会议的最早年份。
正如评论中所建议的，dput(df) 函数将是存储数据的最佳方式。我在我的 reprex 中提供了下面前 6 行的输出。
另外值得注意的是，当使用 read_csv 导入数据时，第一季列最初是作为字符列读入的，因此您可能需要将其转换为双精度或整数值集。我会使用
df$`First season` <- df$`First season` %>% as.integer()
对于这个数据集，我的解决方案如下。
library(tidyverse)
df <- structure(list(School = c("Cincinnati Bearcats", "East Carolina Pirates",
"Houston Cougars", "Memphis Tigers", "Navy Midshipmen", "SMU Mustangs"),
Conference = c("The American", "The American", "The American",
"The American", "The American", "The American"),
`Head coach` = c("Luke Fickell", "Mike Houston", "Dana Holgorsen",
"Ryan Silverfield", "Ken Niumatalolo", "Sonny Dykes"),
`First season` = c(2017, 2019, 2019, 2020, 2007, 2018),
`Current W` = c(35, 7, 7, 8, 101, 22),
`Current L` = c(14, 14, 13, 4, 67, 14),
`Current W%` = c("0.71399999999999997", "0.33300000000000002", "0.35", "0.66700000000000004", "0.60099999999999998", "0.61099999999999999"),
`Career W` = c(41, 7, 68, 8, 101, 63),
`Career L` = c(21, 14, 54, 4, 67, 59),
`Career W%` = c("0.66100000000000003", "0.33300000000000002", "0.55700000000000005", "0.66700000000000004", "0.60099999999999998", "0.51600000000000001"),
`Offensive coordinator(s)` = c("Mike Denbrock", "Donnie Kirkpatrick", "Shannon Dawson", "Kevin Johns", "Ivin Jasper", "Garrett Riley"),
`Defensive coordinator(s)` = c("Mike Tressel", "Blake Harrell", "Doug Belk", "Mike MacIntyre", "Brian Newberry", "Jim Leavitt"),
`Special Teams coordinator(s)` = c("Brian Mason", "Tim Daoust", "Mark Scott", "Vacant", "Danny O'Rourke", "Chris Brasfield")),
row.names = c(NA, -6L), class = c("tbl_df", "tbl", "data.frame"))
df$`First season` <- df$`First season` %>% as.integer()
df %>%
group_by(Conference) %>%
mutate(EarliestStartingTenure = min(`First season`, na.rm))
#> # A tibble: 6 x 14
#> # Groups: Conference [1]
#> School Conference `Head coach` `First season` `Current W` `Current L`
#> <chr> <chr> <chr> <dbl> <dbl> <dbl>
#> 1 Cincinnati B~ The Americ~ Luke Fickell 2017 35 14
#> 2 East Carolin~ The Americ~ Mike Houston 2019 7 14
#> 3 Houston Coug~ The Americ~ Dana Holgors~ 2019 7 13
#> 4 Memphis Tige~ The Americ~ Ryan Silverf~ 2020 8 4
#> 5 Navy Midship~ The Americ~ Ken Niumatal~ 2007 101 67
#> 6 SMU Mustangs The Americ~ Sonny Dykes 2018 22 14
#> # ... with 8 more variables: Current W% <chr>, Career W <dbl>, Career L <dbl>,
#> # Career W% <chr>, Offensive coordinator(s) <chr>,
#> # Defensive coordinator(s) <chr>, Special Teams coordinator(s) <chr>,
#> # EarliestStartingTenure <dbl>
由 reprex package (v2.0.0) 于 2021 年 4 月 7 日创建