You have no missing data. Note that the string "" is not missing! You need to code missings as NA. Have look at ?is.na
ir. Thierry Onkelinx Instituut voor natuur- en bosonderzoek / Research Institute for Nature and Forest team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance Kliniekstraat 25 1070 Anderlecht Belgium + 32 2 525 02 51 + 32 54 43 61 85 [email protected] www.inbo.be To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of. ~ Sir Ronald Aylmer Fisher The plural of anecdote is not data. ~ Roger Brinner The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data. ~ John Tukey -----Oorspronkelijk bericht----- Van: [email protected] [mailto:[email protected]] Namens Bill Verzonden: vrijdag 25 april 2014 13:06 Aan: [email protected] Onderwerp: [R] why does it say all the cases are complete? Hi, Can someone explain why it says the cases are complete. It seems they are not. head(x) rnum Exam.Title Patient.ID Age Sex Impression2 1 1 Temporal bone 3529243 009Y M 2 2 Temporal bone 3529243 010Y M 3 3 Head 3508570 002M M 4 4 Sacrum 3494713 004D F 5 5 Head 3471128 015M F 6 6 Head 3494480 022M M Impression3 AgeByYear Exposure Reason Result 1 9 H 2 10 H 3 0 H premature Negative 4 0 P 5 1 H seizure negative 6 1 H head trauma Negative Repeat Result.1 1 h P 2 r1 P 3 N 4 P 5 N 6 h N > complete.cases(x[1:5,]) [1] TRUE TRUE TRUE TRUE TRUE > class(x) [1] "data.frame" > str(x) 'data.frame': 978 obs. of 13 variables: $ rnum : int 1 2 3 4 5 6 7 8 9 10 ... $ Exam.Title : Factor w/ 75 levels "Abdomen","Abdomen (Post CE)",..: 74 74 21 68 21 21 21 21 2 3 ... $ Patient.ID : int 3529243 3529243 3508570 3494713 3471128 3494480 3494480 3553704 3295006 3295006 ... $ Age : Factor w/ 53 levels "000Y","001D",..: 30 33 4 11 43 51 51 40 33 33 ... $ Sex : Factor w/ 2 levels "F","M": 2 2 2 1 1 2 2 2 1 1 ... $ Impression2: Factor w/ 114 levels "","????","?????",..: 1 1 1 1 1 1 1 1 1 57 ... $ Impression3: Factor w/ 22 levels "","??","??????",..: 1 1 1 1 1 1 1 1 1 13 ... $ AgeByYear : int 9 10 0 0 1 1 1 13 10 10 ... $ Exposure : Factor w/ 27 levels "A","A 2","A P",..: 11 11 11 27 11 11 11 11 1 2 ... $ Reason : Factor w/ 112 levels "","abnormal behavior, check",..: 1 1 80 1 87 36 36 36 1 1 ... $ Result : Factor w/ 7 levels "","Inconclusive",..: 1 1 4 1 3 4 4 4 1 1 ... $ Repeat : Factor w/ 13 levels "","h","r1","r10",..: 2 3 1 1 1 2 3 1 2 6 ... $ Result.1 : Factor w/ 2 levels "N","P": 2 2 1 2 1 1 1 1 2 2 ... > mode(x) [1] "list" [[alternative HTML version deleted]] ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. * * * * * * * * * * * * * D I S C L A I M E R * * * * * * * * * * * * * Dit bericht en eventuele bijlagen geven enkel de visie van de schrijver weer en binden het INBO onder geen enkel beding, zolang dit bericht niet bevestigd is door een geldig ondertekend document. The views expressed in this message and any annex are purely those of the writer and may not be regarded as stating an official position of INBO, as long as the message is not confirmed by a duly signed document. ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
