textbooks <- structure(list(dept_abbr = structure(c(1L, 2L, 2L, 2L, 3L, 3L, 4L, 4L, 5L, 6L, 7L, 8L, 9L, 10L, 11L, 12L, 12L, 13L, 14L, 14L, 15L, 15L, 15L, 15L, 16L, 17L, 18L, 19L, 20L, 21L, 22L, 22L, 22L, 23L, 23L, 24L, 24L, 25L, 26L, 27L, 28L, 28L, 28L, 28L, 28L, 28L, 29L, 30L, 31L, 31L, 31L, 31L, 31L, 32L, 32L, 32L, 33L, 34L, 35L, 36L, 37L, 37L, 38L, 38L, 38L, 38L, 39L, 40L, 40L, 40L, 40L, 41L, 41L), .Label = c("Am Ind", "Anthro", "Art His", "Asia Am", "Ch Engr", "Chicano", "Chin", "Com Sci", "Comm Lit", "Comm St", "Comptng", "E&S Sci", "Econ", "El Engr", "Engl", "Engr", "ESL", "Frnch", "Geog", "German", "Greek", "Hist", "Hlt Ser", "Hnrs", "Lifesci", "Mat Sci", "Math", "Mgmt", "Mus His", "Physics", "Pol Sci", "Psych", "Russian", "Soc Gen", "Soc Wlf", "Sociol", "Span", "Stat", "Urbn Pl", "Wld Art", "Wom Std"), class = "factor"), course = structure(c(1L, 48L, 15L, 27L, 57L, 8L, 24L, 25L, 52L, 63L, 19L, 21L, 40L, 2L, 33L, 47L, 3L, 3L, 29L, 20L, 58L, 16L, 21L, 64L, 23L, 42L, 9L, 36L, 45L, 13L, 50L, 31L, 32L, 66L, 43L, 41L, 60L, 29L, 5L, 17L, 28L, 11L, 12L, 34L, 35L, 38L, 26L, 46L, 2L, 10L, 61L, 18L, 30L, 2L, 14L, 37L, 49L, 4L, 59L, 22L, 6L, 7L, 51L, 54L, 30L, 55L, 65L, 53L, 54L, 56L, 44L, 62L, 39L), .Label = c(" C170", "10", "101", "102W", "104", "105", "115", "118E", "120", "120B", "124", "127B", "130", "134A", "135T", "151", "151A", "171C", "174", "176", "180", "180A", "183EW", "187B", "191E", "191G", "191HB", "1A", "2", "200C", "201B", "201L", "20A", "228", "231D", "232", "263", "263A", "285", "290", "37", "38A", "437", "495", "57", "6A", "7", "9", "90B", "97F", "98T", "C125", "C139", "C180", "C216", "C409A", "M102K", "M104C", "M104D", "M106", "M132B", "M144", "M145B", "M260A", "M275", "M422"), class = "factor"), isbn = structure(c(51L, 1L, 20L, 19L, 58L, 30L, 56L, 54L, 11L, 59L, 50L, 21L, 27L, 13L, 33L, 40L, 28L, 22L, 8L, 35L, 43L, 16L, 24L, 52L, 9L, 68L, 73L, 61L, 17L, 72L, 66L, 15L, 47L, 48L, 49L, 10L, 60L, 46L, 32L, 41L, 5L, 6L, 23L, 3L, 7L, 4L, 12L, 42L, 25L, 70L, 18L, 29L, 36L, 64L, 2L, 37L, 45L, 39L, 63L, 53L, 44L, 34L, 26L, 69L, 31L, 65L, 71L, 38L, 62L, 14L, 55L, 67L, 57L), .Label = c("978-0030119194", "978-0073378541", "978-0073379661", "978-0073404769", "978-0077251031", "978-0078136634", "978-0131407374", "978-0131497269", "978-0132306416", "978-0140447187", "978-0195123401", "978-0195162578", "978-0195181234", "978-0195390827", "978-0198149248", "978-0199561339", "978-0205668946", "978-0205753383", "978-0226206813", "978-0300080643", "978-0321295354", "978-0324421620", "978-0324828641", "978-0374515362", "978-0393090406", "978-0393310726", "978-0393329254", "978-0393927634", "978-0393976267", "978-0394723693", "978-0412043710", "978-0470419977", "978-0470509487", "978-0471013914", "978-0471287704", "978-0471663799", "978-0495099697", "978-0520224759", "978-0520265882", "978-0521711128", "978-0534407612", "978-0534491437", "978-0582276024", "978-0618527748", "978-0674304437", "978-0716776710", "978-0742567498", "978-0761918479", "978-0763745554", "978-0791420621", "978-0803272620", "978-0804747295", "978-0812968378", "978-0816646135", "978-0820474151", "978-0822338437", "978-0822341147", "978-0892365999", "978-0896086265", "978-1400033416", "978-1405102667", "978-1412923484", "978-1412969666", "978-1429227049", "978-1441931566", "978-1560000259", "978-1570755637", "978-1577665304", "978-1584883883", "978-1588264169", "978-1592134328", "978-1598561692", "978-2020525718"), class = "factor"), ucla_new = c(27.670000000000002, 40.590000000000003, 31.68, 16, 18.949999999999999, 14.949999999999999, 24.699999999999999, 19.5, 123.84, 17, 31.629999999999999, 116, 27.670000000000002, 24.699999999999999, 126.67, 53.899999999999999, 89.730000000000004, 171, 152, 124.8, 16, 25.949999999999999, 18, 21.73, 40.590000000000003, 28.949999999999999, 19.949999999999999, 49.450000000000003, 41.090000000000003, 50.950000000000003, 44.5, 82.450000000000003, 34.600000000000001, 88.420000000000002, 84, 11.25, 15, 180.03, 174, 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2L, 2L, 2L), .Label = c("N", "Y"), class = "factor"), diff = c(-0.28000000000000003, 9.4499999999999993, -0.32000000000000001, 4.4800000000000004, 4.7400000000000002, 4.7800000000000002, 4.6399999999999997, 2.8399999999999999, 17.59, 3.7400000000000002, 1.6799999999999999, 27.91, 9.2200000000000006, 8.2300000000000004, 29.289999999999999, 6.3899999999999997, 14.800000000000001, 38.229999999999997, 30.5, 16.800000000000001, 4.3300000000000001, 7.0099999999999998, 5.7599999999999998, -0.22, 9.4499999999999993, 0, 3.7999999999999998, 11.699999999999999, 9.3100000000000005, 17.98, 13.630000000000001, -2.5499999999999998, -0.34999999999999998, -9.5299999999999994, 2.8199999999999998, 1.75, 4.7999999999999998, 45.340000000000003, 30.25, 12.58, -3.8799999999999999, 38.350000000000001, 40.939999999999998, 66, 36.32, 39.079999999999998, -0.25, 28.719999999999999, 6.6299999999999999, 5.2000000000000002, 12.449999999999999, 4.1900000000000004, 44.399999999999999, 30.710000000000001, 17.719999999999999, 19.690000000000001, 5.3899999999999997, -0.25, 4.2599999999999998, 0.41999999999999998, 27.149999999999999, 16.620000000000001, 3.3500000000000001, 14.050000000000001, 11.73, 14.26, 4.96, -1.46, 9.1199999999999992, 13.18, 5.46, 5.04, 9.4800000000000004)), row.names = c(NA, -73L), class = c("tbl_df", "tbl", "data.frame"))