Create Dummy Variables
Arguments
- x
yvariable used to create the dummy variables.- subset
clustera subset of the data, if desired.- reference
the reference value for the dummy variables to compare to.
- includeAll
logical value indicating whether all of the dummy variables should be returned (including the reference).
Examples
data(mri)
# Create a dummy variable for chd
dummy(mri$chd)
#> 1 vs 0 2 vs 0
#> [1,] 1 0
#> [2,] 0 0
#> [3,] 0 0
#> [4,] 0 0
#> [5,] 0 0
#> [6,] 0 0
#> [7,] 0 0
#> [8,] 0 0
#> [9,] 0 0
#> [10,] 0 0
#> [11,] 0 0
#> [12,] 1 0
#> [13,] 0 0
#> [14,] 0 0
#> [15,] 0 0
#> [16,] 0 0
#> [17,] 1 0
#> [18,] 0 0
#> [19,] 0 0
#> [20,] 0 0
#> [21,] 0 0
#> [22,] 0 0
#> [23,] 0 0
#> [24,] 0 0
#> [25,] 0 0
#> [26,] 0 0
#> [27,] 0 0
#> [28,] 0 0
#> [29,] 0 0
#> [30,] 0 0
#> [31,] 0 0
#> [32,] 0 0
#> [33,] 0 0
#> [34,] 0 0
#> [35,] 0 0
#> [36,] 0 0
#> [37,] 0 0
#> [38,] 0 0
#> [39,] 0 0
#> [40,] 0 0
#> [41,] 0 0
#> [42,] 0 0
#> [43,] 0 0
#> [44,] 0 1
#> [45,] 0 0
#> [46,] 0 0
#> [47,] 0 0
#> [48,] 0 0
#> [49,] 0 0
#> [50,] 0 0
#> [51,] 0 0
#> [52,] 0 1
#> [53,] 0 0
#> [54,] 0 0
#> [55,] 0 0
#> [56,] 0 0
#> [57,] 1 0
#> [58,] 0 0
#> [59,] 0 0
#> [60,] 0 1
#> [61,] 0 0
#> [62,] 0 0
#> [63,] 0 0
#> [64,] 0 0
#> [65,] 0 0
#> [66,] 0 0
#> [67,] 0 0
#> [68,] 0 0
#> [69,] 1 0
#> [70,] 0 0
#> [71,] 0 0
#> [72,] 0 0
#> [73,] 0 0
#> [74,] 0 0
#> [75,] 0 0
#> [76,] 0 1
#> [77,] 0 0
#> [78,] 0 0
#> [79,] 1 0
#> [80,] 0 0
#> [81,] 0 0
#> [82,] 0 0
#> [83,] 0 0
#> [84,] 0 0
#> [85,] 0 0
#> [86,] 0 0
#> [87,] 0 0
#> [88,] 0 0
#> [89,] 0 0
#> [90,] 0 0
#> [91,] 0 0
#> [92,] 1 0
#> [93,] 0 0
#> [94,] 0 0
#> [95,] 0 0
#> [96,] 0 1
#> [97,] 0 0
#> [98,] 0 0
#> [99,] 0 0
#> [100,] 1 0
#> [101,] 0 0
#> [102,] 0 0
#> [103,] 0 0
#> [104,] 0 0
#> [105,] 0 0
#> [106,] 1 0
#> [107,] 0 0
#> [108,] 0 0
#> [109,] 0 1
#> [110,] 0 0
#> [111,] 1 0
#> [112,] 0 0
#> [113,] 0 0
#> [114,] 0 0
#> [115,] 0 0
#> [116,] 0 0
#> [117,] 0 0
#> [118,] 0 1
#> [119,] 0 0
#> [120,] 0 0
#> [121,] 0 1
#> [122,] 0 0
#> [123,] 0 0
#> [124,] 0 0
#> [125,] 0 0
#> [126,] 0 0
#> [127,] 0 1
#> [128,] 0 0
#> [129,] 1 0
#> [130,] 0 0
#> [131,] 0 0
#> [132,] 0 1
#> [133,] 0 0
#> [134,] 0 0
#> [135,] 0 0
#> [136,] 0 0
#> [137,] 0 0
#> [138,] 0 0
#> [139,] 0 1
#> [140,] 0 0
#> [141,] 0 0
#> [142,] 0 0
#> [143,] 0 0
#> [144,] 0 0
#> [145,] 0 0
#> [146,] 0 0
#> [147,] 0 0
#> [148,] 0 0
#> [149,] 0 1
#> [150,] 0 0
#> [151,] 0 0
#> [152,] 0 0
#> [153,] 0 0
#> [154,] 0 0
#> [155,] 0 0
#> [156,] 0 0
#> [157,] 0 0
#> [158,] 0 0
#> [159,] 0 0
#> [160,] 0 0
#> [161,] 0 0
#> [162,] 0 0
#> [163,] 0 0
#> [164,] 0 0
#> [165,] 0 0
#> [166,] 0 0
#> [167,] 0 0
#> [168,] 0 0
#> [169,] 0 0
#> [170,] 0 0
#> [171,] 0 0
#> [172,] 1 0
#> [173,] 0 0
#> [174,] 0 0
#> [175,] 1 0
#> [176,] 0 0
#> [177,] 0 0
#> [178,] 0 0
#> [179,] 0 1
#> [180,] 0 0
#> [181,] 0 0
#> [182,] 0 0
#> [183,] 0 0
#> [184,] 0 0
#> [185,] 0 0
#> [186,] 0 0
#> [187,] 0 1
#> [188,] 1 0
#> [189,] 0 0
#> [190,] 0 1
#> [191,] 0 0
#> [192,] 0 0
#> [193,] 0 0
#> [194,] 0 0
#> [195,] 0 0
#> [196,] 1 0
#> [197,] 0 0
#> [198,] 0 0
#> [199,] 0 0
#> [200,] 0 0
#> [201,] 0 0
#> [202,] 0 0
#> [203,] 0 0
#> [204,] 0 1
#> [205,] 1 0
#> [206,] 0 0
#> [207,] 1 0
#> [208,] 0 0
#> [209,] 0 0
#> [210,] 0 0
#> [211,] 0 1
#> [212,] 1 0
#> [213,] 0 0
#> [214,] 0 0
#> [215,] 0 0
#> [216,] 0 1
#> [217,] 0 0
#> [218,] 0 0
#> [219,] 0 0
#> [220,] 0 0
#> [221,] 0 1
#> [222,] 0 0
#> [223,] 0 0
#> [224,] 0 0
#> [225,] 0 1
#> [226,] 0 0
#> [227,] 0 0
#> [228,] 0 1
#> [229,] 0 0
#> [230,] 0 0
#> [231,] 0 0
#> [232,] 0 0
#> [233,] 0 0
#> [234,] 0 0
#> [235,] 1 0
#> [236,] 0 0
#> [237,] 0 0
#> [238,] 0 0
#> [239,] 0 0
#> [240,] 0 0
#> [241,] 0 0
#> [242,] 0 0
#> [243,] 0 1
#> [244,] 0 0
#> [245,] 0 1
#> [246,] 0 0
#> [247,] 0 0
#> [248,] 0 0
#> [249,] 0 1
#> [250,] 0 1
#> [251,] 0 0
#> [252,] 0 1
#> [253,] 0 0
#> [254,] 0 0
#> [255,] 0 0
#> [256,] 0 0
#> [257,] 0 0
#> [258,] 0 0
#> [259,] 0 0
#> [260,] 0 0
#> [261,] 0 0
#> [262,] 0 1
#> [263,] 0 1
#> [264,] 0 0
#> [265,] 0 0
#> [266,] 0 0
#> [267,] 1 0
#> [268,] 0 0
#> [269,] 0 0
#> [270,] 0 0
#> [271,] 0 0
#> [272,] 0 0
#> [273,] 0 0
#> [274,] 0 0
#> [275,] 0 1
#> [276,] 0 0
#> [277,] 1 0
#> [278,] 0 0
#> [279,] 0 0
#> [280,] 0 0
#> [281,] 0 0
#> [282,] 0 0
#> [283,] 0 0
#> [284,] 0 0
#> [285,] 0 0
#> [286,] 0 0
#> [287,] 0 1
#> [288,] 0 0
#> [289,] 0 1
#> [290,] 0 0
#> [291,] 0 0
#> [292,] 0 0
#> [293,] 0 0
#> [294,] 0 0
#> [295,] 0 0
#> [296,] 1 0
#> [297,] 0 0
#> [298,] 0 0
#> [299,] 0 0
#> [300,] 0 1
#> [301,] 0 0
#> [302,] 0 0
#> [303,] 1 0
#> [304,] 0 0
#> [305,] 0 0
#> [306,] 0 0
#> [307,] 0 0
#> [308,] 0 0
#> [309,] 0 0
#> [310,] 0 0
#> [311,] 0 1
#> [312,] 0 0
#> [313,] 0 0
#> [314,] 0 0
#> [315,] 0 0
#> [316,] 0 1
#> [317,] 0 0
#> [318,] 0 0
#> [319,] 0 0
#> [320,] 0 0
#> [321,] 0 0
#> [322,] 0 1
#> [323,] 0 0
#> [324,] 0 0
#> [325,] 0 1
#> [326,] 0 0
#> [327,] 0 0
#> [328,] 0 0
#> [329,] 0 1
#> [330,] 1 0
#> [331,] 1 0
#> [332,] 0 0
#> [333,] 0 0
#> [334,] 0 0
#> [335,] 0 0
#> [336,] 0 0
#> [337,] 0 1
#> [338,] 0 0
#> [339,] 0 0
#> [340,] 0 0
#> [341,] 0 0
#> [342,] 0 0
#> [343,] 1 0
#> [344,] 0 0
#> [345,] 0 0
#> [346,] 0 0
#> [347,] 0 0
#> [348,] 0 0
#> [349,] 0 0
#> [350,] 0 0
#> [351,] 0 1
#> [352,] 0 0
#> [353,] 0 1
#> [354,] 0 0
#> [355,] 0 0
#> [356,] 0 0
#> [357,] 0 0
#> [358,] 0 0
#> [359,] 0 0
#> [360,] 0 0
#> [361,] 0 0
#> [362,] 0 0
#> [363,] 0 0
#> [364,] 0 0
#> [365,] 0 0
#> [366,] 0 0
#> [367,] 1 0
#> [368,] 0 1
#> [369,] 0 0
#> [370,] 0 0
#> [371,] 0 0
#> [372,] 0 0
#> [373,] 0 0
#> [374,] 0 0
#> [375,] 0 0
#> [376,] 0 0
#> [377,] 0 0
#> [378,] 0 0
#> [379,] 0 0
#> [380,] 0 0
#> [381,] 0 1
#> [382,] 0 1
#> [383,] 0 0
#> [384,] 0 0
#> [385,] 0 0
#> [386,] 0 0
#> [387,] 0 0
#> [388,] 0 0
#> [389,] 0 0
#> [390,] 0 0
#> [391,] 0 0
#> [392,] 0 0
#> [393,] 0 0
#> [394,] 0 0
#> [395,] 0 0
#> [396,] 0 0
#> [397,] 0 0
#> [398,] 0 0
#> [399,] 0 0
#> [400,] 0 0
#> [401,] 0 0
#> [402,] 0 0
#> [403,] 0 0
#> [404,] 0 0
#> [405,] 0 0
#> [406,] 0 1
#> [407,] 0 0
#> [408,] 0 0
#> [409,] 0 0
#> [410,] 0 1
#> [411,] 0 0
#> [412,] 0 0
#> [413,] 0 0
#> [414,] 0 0
#> [415,] 0 0
#> [416,] 0 1
#> [417,] 0 0
#> [418,] 0 0
#> [419,] 0 0
#> [420,] 0 1
#> [421,] 0 0
#> [422,] 0 0
#> [423,] 1 0
#> [424,] 0 0
#> [425,] 0 0
#> [426,] 0 0
#> [427,] 0 1
#> [428,] 1 0
#> [429,] 0 1
#> [430,] 0 0
#> [431,] 0 0
#> [432,] 0 0
#> [433,] 1 0
#> [434,] 0 0
#> [435,] 1 0
#> [436,] 0 0
#> [437,] 0 0
#> [438,] 1 0
#> [439,] 0 0
#> [440,] 0 0
#> [441,] 0 0
#> [442,] 0 0
#> [443,] 0 0
#> [444,] 0 1
#> [445,] 1 0
#> [446,] 0 0
#> [447,] 0 0
#> [448,] 0 0
#> [449,] 0 0
#> [450,] 1 0
#> [451,] 0 0
#> [452,] 0 0
#> [453,] 0 1
#> [454,] 0 1
#> [455,] 0 0
#> [456,] 0 0
#> [457,] 0 0
#> [458,] 1 0
#> [459,] 0 0
#> [460,] 1 0
#> [461,] 1 0
#> [462,] 0 0
#> [463,] 0 0
#> [464,] 0 0
#> [465,] 0 0
#> [466,] 0 0
#> [467,] 0 0
#> [468,] 0 0
#> [469,] 0 0
#> [470,] 1 0
#> [471,] 0 0
#> [472,] 0 1
#> [473,] 0 1
#> [474,] 0 1
#> [475,] 0 0
#> [476,] 0 0
#> [477,] 0 0
#> [478,] 0 0
#> [479,] 1 0
#> [480,] 0 0
#> [481,] 1 0
#> [482,] 1 0
#> [483,] 0 0
#> [484,] 0 0
#> [485,] 0 1
#> [486,] 1 0
#> [487,] 0 0
#> [488,] 0 0
#> [489,] 0 0
#> [490,] 0 1
#> [491,] 0 0
#> [492,] 1 0
#> [493,] 0 0
#> [494,] 1 0
#> [495,] 0 1
#> [496,] 0 0
#> [497,] 0 0
#> [498,] 0 0
#> [499,] 0 0
#> [500,] 0 0
#> [501,] 0 0
#> [502,] 0 1
#> [503,] 0 0
#> [504,] 0 1
#> [505,] 0 1
#> [506,] 0 0
#> [507,] 0 0
#> [508,] 0 1
#> [509,] 0 1
#> [510,] 0 0
#> [511,] 0 0
#> [512,] 0 0
#> [513,] 0 1
#> [514,] 0 0
#> [515,] 0 0
#> [516,] 1 0
#> [517,] 0 0
#> [518,] 0 0
#> [519,] 0 0
#> [520,] 0 0
#> [521,] 0 0
#> [522,] 0 0
#> [523,] 1 0
#> [524,] 1 0
#> [525,] 0 0
#> [526,] 0 1
#> [527,] 0 0
#> [528,] 1 0
#> [529,] 0 0
#> [530,] 0 0
#> [531,] 0 0
#> [532,] 0 0
#> [533,] 0 0
#> [534,] 0 0
#> [535,] 0 0
#> [536,] 0 0
#> [537,] 0 1
#> [538,] 0 1
#> [539,] 0 0
#> [540,] 0 0
#> [541,] 1 0
#> [542,] 0 0
#> [543,] 0 0
#> [544,] 0 0
#> [545,] 0 1
#> [546,] 0 0
#> [547,] 1 0
#> [548,] 1 0
#> [549,] 1 0
#> [550,] 0 0
#> [551,] 0 0
#> [552,] 0 0
#> [553,] 0 0
#> [554,] 0 0
#> [555,] 0 0
#> [556,] 0 0
#> [557,] 0 0
#> [558,] 0 1
#> [559,] 0 1
#> [560,] 0 0
#> [561,] 0 1
#> [562,] 0 0
#> [563,] 0 0
#> [564,] 0 0
#> [565,] 0 1
#> [566,] 0 1
#> [567,] 0 0
#> [568,] 0 1
#> [569,] 0 0
#> [570,] 0 1
#> [571,] 0 0
#> [572,] 1 0
#> [573,] 0 0
#> [574,] 0 0
#> [575,] 0 0
#> [576,] 0 0
#> [577,] 0 0
#> [578,] 0 0
#> [579,] 0 1
#> [580,] 0 0
#> [581,] 1 0
#> [582,] 0 0
#> [583,] 1 0
#> [584,] 0 0
#> [585,] 0 1
#> [586,] 0 0
#> [587,] 0 0
#> [588,] 0 0
#> [589,] 0 0
#> [590,] 0 0
#> [591,] 0 0
#> [592,] 0 0
#> [593,] 0 0
#> [594,] 0 1
#> [595,] 1 0
#> [596,] 0 0
#> [597,] 0 0
#> [598,] 0 0
#> [599,] 0 0
#> [600,] 0 0
#> [601,] 0 0
#> [602,] 0 0
#> [603,] 1 0
#> [604,] 0 1
#> [605,] 0 0
#> [606,] 0 0
#> [607,] 0 0
#> [608,] 0 0
#> [609,] 0 1
#> [610,] 0 0
#> [611,] 0 0
#> [612,] 0 0
#> [613,] 0 0
#> [614,] 0 0
#> [615,] 0 0
#> [616,] 0 0
#> [617,] 0 0
#> [618,] 0 0
#> [619,] 0 0
#> [620,] 0 0
#> [621,] 0 1
#> [622,] 0 0
#> [623,] 0 0
#> [624,] 0 0
#> [625,] 0 0
#> [626,] 0 0
#> [627,] 0 0
#> [628,] 0 0
#> [629,] 0 0
#> [630,] 0 0
#> [631,] 0 1
#> [632,] 0 0
#> [633,] 0 0
#> [634,] 0 1
#> [635,] 0 0
#> [636,] 0 0
#> [637,] 0 0
#> [638,] 0 0
#> [639,] 0 0
#> [640,] 0 0
#> [641,] 0 0
#> [642,] 0 1
#> [643,] 0 0
#> [644,] 0 0
#> [645,] 0 0
#> [646,] 0 0
#> [647,] 0 0
#> [648,] 0 0
#> [649,] 0 0
#> [650,] 0 1
#> [651,] 0 0
#> [652,] 0 0
#> [653,] 0 0
#> [654,] 0 0
#> [655,] 0 0
#> [656,] 0 0
#> [657,] 0 1
#> [658,] 0 0
#> [659,] 0 0
#> [660,] 0 0
#> [661,] 0 0
#> [662,] 0 0
#> [663,] 0 0
#> [664,] 0 0
#> [665,] 0 0
#> [666,] 0 0
#> [667,] 0 0
#> [668,] 1 0
#> [669,] 0 0
#> [670,] 0 0
#> [671,] 0 0
#> [672,] 1 0
#> [673,] 0 0
#> [674,] 0 0
#> [675,] 0 0
#> [676,] 0 0
#> [677,] 0 0
#> [678,] 0 0
#> [679,] 0 0
#> [680,] 0 0
#> [681,] 1 0
#> [682,] 0 0
#> [683,] 0 0
#> [684,] 1 0
#> [685,] 0 0
#> [686,] 0 0
#> [687,] 0 1
#> [688,] 0 0
#> [689,] 0 0
#> [690,] 1 0
#> [691,] 1 0
#> [692,] 0 0
#> [693,] 0 0
#> [694,] 0 0
#> [695,] 0 0
#> [696,] 0 0
#> [697,] 0 0
#> [698,] 0 0
#> [699,] 0 0
#> [700,] 0 1
#> [701,] 0 0
#> [702,] 0 0
#> [703,] 0 0
#> [704,] 0 0
#> [705,] 0 0
#> [706,] 0 0
#> [707,] 0 0
#> [708,] 0 0
#> [709,] 0 0
#> [710,] 0 0
#> [711,] 0 0
#> [712,] 0 0
#> [713,] 0 0
#> [714,] 0 0
#> [715,] 0 0
#> [716,] 0 0
#> [717,] 1 0
#> [718,] 0 1
#> [719,] 0 0
#> [720,] 0 0
#> [721,] 0 1
#> [722,] 0 0
#> [723,] 0 0
#> [724,] 0 0
#> [725,] 0 0
#> [726,] 0 0
#> [727,] 0 0
#> [728,] 0 0
#> [729,] 0 1
#> [730,] 0 0
#> [731,] 0 0
#> [732,] 0 0
#> [733,] 0 0
#> [734,] 0 0
#> [735,] 0 0
#> attr(,"transformation")
#> [1] "dummy"
#> attr(,"reference")
#> [1] 0 1 2
#> attr(,"name")
#> [1] "dummy(mri$chd)"
#> attr(,"prnm")
#> [1] "mri$chd"
#> attr(,"original")
#> [1] 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
#> [38] 0 0 0 0 0 0 2 0 0 0 0 0 0 0 2 0 0 0 0 1 0 0 2 0 0 0 0 0 0 0 0 1 0 0 0 0 0
#> [75] 0 2 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 2 0 0 0 1 0 0 0 0 0 1 0 0 2 0 1
#> [112] 0 0 0 0 0 0 2 0 0 2 0 0 0 0 0 2 0 1 0 0 2 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0
#> [149] 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 2 0 0 0 0 0 0
#> [186] 0 2 1 0 2 0 0 0 0 0 1 0 0 0 0 0 0 0 2 1 0 1 0 0 0 2 1 0 0 0 2 0 0 0 0 2 0
#> [223] 0 0 2 0 0 2 0 0 0 0 0 0 1 0 0 0 0 0 0 0 2 0 2 0 0 0 2 2 0 2 0 0 0 0 0 0 0
#> [260] 0 0 2 2 0 0 0 1 0 0 0 0 0 0 0 2 0 1 0 0 0 0 0 0 0 0 0 2 0 2 0 0 0 0 0 0 1
#> [297] 0 0 0 2 0 0 1 0 0 0 0 0 0 0 2 0 0 0 0 2 0 0 0 0 0 2 0 0 2 0 0 0 2 1 1 0 0
#> [334] 0 0 0 2 0 0 0 0 0 1 0 0 0 0 0 0 0 2 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 0 0
#> [371] 0 0 0 0 0 0 0 0 0 0 2 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0
#> [408] 0 0 2 0 0 0 0 0 2 0 0 0 2 0 0 1 0 0 0 2 1 2 0 0 0 1 0 1 0 0 1 0 0 0 0 0 2
#> [445] 1 0 0 0 0 1 0 0 2 2 0 0 0 1 0 1 1 0 0 0 0 0 0 0 0 1 0 2 2 2 0 0 0 0 1 0 1
#> [482] 1 0 0 2 1 0 0 0 2 0 1 0 1 2 0 0 0 0 0 0 2 0 2 2 0 0 2 2 0 0 0 2 0 0 1 0 0
#> [519] 0 0 0 0 1 1 0 2 0 1 0 0 0 0 0 0 0 0 2 2 0 0 1 0 0 0 2 0 1 1 1 0 0 0 0 0 0
#> [556] 0 0 2 2 0 2 0 0 0 2 2 0 2 0 2 0 1 0 0 0 0 0 0 2 0 1 0 1 0 2 0 0 0 0 0 0 0
#> [593] 0 2 1 0 0 0 0 0 0 0 1 2 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0
#> [630] 0 2 0 0 2 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 2 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0
#> [667] 0 1 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 1 0 0 2 0 0 1 1 0 0 0 0 0 0 0 0 2 0 0 0
#> [704] 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 0 0 2 0 0 0 0 0 0 0 2 0 0 0 0 0 0
#> attr(,"groups")
#> [1] 0 1 2
#> attr(,"labels")
#> attr(,"labels")[[1]]
#> NULL
#>
#> attr(,"labels")[[2]]
#> [1] "1 vs 0" "2 vs 0"
#>
#> attr(,"reference_name")
#> [1] 0 1 2