R language Combat-basic data Management (2)

Tag: Cal sys char date conversion ring width std es2017 log

5. Missing values

> y <-C (1,2,3,na) > Is.na (y) [1] false false true> leadership Manager testdate Country Gender age Item1      Item2 item3 item4 item51 1 10/24/08 US M 5 4 5 5 2 10/28/08 US      F 3 5 2 5 3 10/1/08 UK F 25 3 5 5 5 24 4 10/12/08 UK M 3 3 4 na NA5 5 5/1/09 UK F NA 2 2 1 2 1 Strin           Gasfactors agecat1 false Young2 false Young3 false Young4 false Young5     FALSE <NA>> leadership[,6:10] item1 item2 item3 item4 item51 5 4 5 5 52 3 5 2 5 3 5 5 5 3 3 4 NA NA5 2 2 1 2 1> is.na (lead ERSHIP[,6:10]) item1 item2 item3 Item4 item51 false false False FALSE2 false false FALSE3 false F Alse false FALSE4 FalseFalse false TRUE TRUE5 false False false>  

5.1 Re-encoding some values as missing values

5.2 Excluding missing values in analysis

> x <-C (1,2,na,3) > y <-x[1] + x[2] + x[3] + x[4]> z <-sum (x) > X[1] 1 2 NA 3> y[1] na> z[1  ] na> > > x <-C (1,2,na,3) > y <-sum (x, na.rm=true) > > xerror:object ' x ' not found> x[1] 1 2      NA 3> Y[1] 6> leadership manager testdate Country Gender age item1 item2 item3 item4 item51 1 10/24/08  US M 5 4 5 5 2 10/28/08 US F 45 3 5 2 5 53 3 10/1/08 UK F 3 5 5 5 4 10/12/08 UK M (3 3 4 NA N           A5 5 5/1/09 UK F NA 2 2 1 2 1 stringasfactors agecat1 FALSE Young2 False Young3 false Young4 false Young5 false <NA>> NewData <-na.omit      (leadership) > NewData Manager testdate Country Gender age item1 item2 item3 item4 item51 1 10/24/08 US M 32 5 4 5     5 2 10/28/08 US F 3 5 2 5 3 10/1/08 UK F 25 3 5 5 5 2 Stringasfactors agecat1 false Young2 false Young3 false YOUNG&G  T

6. Date value

> Mydates <-as. Date (C ("2007-06-22", "2004-02-13")) > Mydates[1] "2007-06-22" "2004-02-13" > > > Strdates <-C ("01/05/1965 "," 08/16/1975 ") > Strdates[1]" 01/05/1965 "" 08/16/1975 "> Dates <-as. Date (Strdates, "%m/%d/%y") > Dates[1] "1965-01-05" "1975-08-16" > > MyFormat <-"%m/%d/%y" > leadership$ Date <-as. Date (Leadership$date, MyFormat) Error in as. Date.default (Leadership$date, MyFormat): Don't know how to convert ' leadership$date ' to class ' Date ' > Leadership$te Stdate <-as. Date (Leadership$date, MyFormat) Error in as. Date.default (Leadership$date, MyFormat): Don't know how to convert ' leadership$date ' to class ' Date ' > Leadership$te Stdate <-as. Date (Leadership$testdate, MyFormat) > Leadership$testdate[1] "2008-10-24" "2008-10-28" "2008-10-01" "2008-10-12" " 2009-05-01 "> Leadership Manager TestDate Country Gender age item1 item2 item3 item4 item51 1 2008-10-24 U S M 32 5 4 5 5 52 2 2008-10-28 US F 3 5 2 5 3 2008-10-01 UK F 25 3 5 5     5 4 2008-10-12 UK M 3 3 4 na NA5 5 2009-05-01 uk F na 2           2 1 2 1 Stringasfactors agecat1 false Young2 false Young3 false Young4  False Young5 false <NA>> > Sys.date () [1] "2017-09-07" > Date () [1] "Thu Sep 07 22:40:04 "> Today <-sys.date () > Format (today, format="%B%d%Y ") [1]" September "> Format (Today, format="%A ") [1]" Thursday "> > > StartDate <-as. Date ("2004-02-13") > EndDate <-as. Date ("2011-01-22") > Days <-enddate-startdate> daystime difference of 2535 days> > > Today <-SYS.D Ate () > Dob <-as. Date ("1988-06-30") > Difftime (Today, DOB, units= "weeks") time difference of 1523 weeks> difftime (today, DOB, units= " Days ") time difference of 10661 days> Format (DOB, format= "%A") [1] "Thursday" > Format (AS. Date ("2017-09-07"), format= "%A") [1] "Thursday" > Format (AS.  Date ("2017-09-06"), format= "%A") [1] "Wednesday" >

6.1 Converting a date to a character variable

6.2 Further

Help (AS. Date) Help (Strftime) help (isodatetime) lubridate Package Fcalendar Package

7. Type Conversion

R language Combat-basic data Management (2)