Name Sex Age Height Weight Alfred M 14 69 112.5 Alice F 13 56.5 84 Barbara F 13 65.3 98 Carol F 14 62.8 102.5 Henry M 14 63.5 102.5 James M 12 57.3 . Jane F 12 59.8 . Janet F 15 62.5 112.5 Jeffrey M 13 62.5 84 John M 12 59 . Joyce F 11 51.3 50.5 Judy F 14 64.3 90 Louise F 12 56.3 . Mary F 15 66.5 112 Philip M 16 72 150 Robert M 12 64.8 . Ronald M 15 67 133 Thomas M 11 57.5 85 William M 15 66.5 112 in above data weight variable has some missings so we use locf method and fill up missing values and the same time assign dtype=locf like below table new_weight Name Sex Age Height Weight dtype 112.5 Alfred M 14 69 112.5 84 Alice F 13 56.5 84 98 Barbara F 13 65.3 98 102.5 Carol F 14 62.8 102.5 102.5 Henry M 14 63.5 102.5 102.5 James M 12 57.3 . locf 102.5 Jane F 12 59.8 . locf 112.5 Janet F 15 62.5 112.5 84 Jeffrey M 13 62.5 84 84 John M 12 59 . locf 50.5 Joyce F 11 51.3 50.5 90 Judy F 14 64.3 90 90 Louise F 12 56.3 . locf 112 Mary F 15 66.5 112 150 Philip M 16 72 150 150 Robert M 12 64.8 . locf 133 Ronald M 15 67 133 85 Thomas M 11 57.5 85 112 William M 15 66.5 112
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