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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: RE: RE: identifying rounded numbers |

Date |
Fri, 7 Jun 2002 19:26:48 +0100 |

Anja Decressin wrote > > I have wage data and would like to identify if an observation has been > > rounded. > > I would like to know if a number has been rounded with regard > > to the last > > digit and the last two digit. > > > > obervation number wage "last digit rounded" > > "last two digit rounded" > > 1. 500 yes > > yes > > 2. 1441 no > > no > > 3. 1450 yes > > no > > > > Is there a way to identify if a number is an integer? Then I > > could just > > divide it by 10 or 100 and check if it is an integer. > > > > I could alsp try to make a string variable out of the "wage"-value > > (using -decode(wage),gen(strwage)- would require me to create > > labels for the > > values, probably through some loop), counting the length of the string > > (through -length(s)-), and then using -index(strwage,"0")- > > and the length(s) > > value to find the 0s. > > This seems way too complicated. > > > > I guess, I could program a loop > > gen round10=. > > program define rounded10 > > local i=1 > > while`1' <=1000 { > > replace round10=1 if wage=i > > local i=`i' +1 > > } > > end > > > > but there must be Stata command for this?! and Nick Winter wrote > > How about: > > . generate rounded1 = ((int(wage/10)*10) == wage) if wage != . > . generate rounded2 = ((int(wage/100)*100) == wage) if wage != . > > How this works: > > The stuff between the first equal sign and the -if- is an expression > that evaluates to one or zero. It evaluates to one (ie, 'true'), if > (int(wage/10)*10) equals wage, which will be the case only when the > final digit of wage is zero. > > The -if wage!=.- ensures that the rounded variable is not assigned for > cases where wage is missing. A variation on Nick's theme (and to underline that you do not need to play with strings to attack this): Alternatively, use -mod(,)- and then negate the result. gen rounded1 = !mod(wage,10) if wage < . gen rounded2 = !mod(wage,100) if wage < . Explanation: 1. mod(wage,10) is 0 if wage is a multiple of 10 and not 0 otherwise. The negation of 0 is 1 and of (not 0) is 0. You might find it helpful to think of mod(,) as supplying the remainder from a division, or whatever language is fashionable among school mathematics teachers. 2. Same principle for multiple of 100. 3. wage missing is mapped to rounded? missing. A future "Speaking Stata" column in Stata Journal 2(4), 2002 -- the Winter issue -- will be devoted to favourite functions. I am always on the lookout for nice examples. Nick n.j.cox@durham.ac.uk * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**st: RE: RE: identifying rounded numbers (graphics comment)***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

**References**:**st: RE: identifying rounded numbers***From:*"Nick Winter" <nwinter@policystudies.com>

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