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From |
sabbas gidarokostas <sabbasgidarokostas@googlemail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: how to get monthly values from Bimonthly data |

Date |
Tue, 31 Jul 2012 18:45:22 +0100 |

thanks Nick for your reply and the useful code. But I need to convert these values to monthly data because the rest of my data are only monthly values. cheers On 7/31/12, Nick Cox <njcoxstata@gmail.com> wrote: > I would leave these data almost as they are. What you can do is > > gen year = real(substr(dates, -4, 4)) > gen period = substr(dates, 1, 2) > gen month = cond(per == "JF", 1, cond(per == "MA", 3, cond(per == > "MJ", 5, cond(per == "JA", 7, cond(per == "SO", 9, cond(per == "ND", > 11, .)))))) > > gen date = ym(year, month) > tsset id date , delta(2) > > The key point is that you have bimonthly data and that's fine. No > doubling up or interpolation is needed; in fact that can only produce > a spurious increase in your sample size. > > Some people would undoubtedly prefer -recode- for the mapping "JF" -> 1, > etc. > > Nick > > On Fri, Jul 27, 2012 at 3:48 AM, sabbas gidarokostas > <sabbasgidarokostas@googlemail.com> wrote: >> Dear all, >> >> I have the following panel data set >> clear all >> input str8 (id text dates values1 >> values2 ) >> >> "1" "ot" " " "" " " >> "1" "wt" " " "" " " >> "1" "rt" "MA 2005" "32.4" "2.5" >> "1" "gh" "MJ 2005" "82.3" "12.5" >> "1" "bg" "JA 2005" "2.5" "24.5" >> "1" "se" "SO 2005" "82.5" " " >> "1" "cv" "ND 2005" "62.3" "26.3" >> "1" "cv" "JF 2006" "12.2" "22.3" >> "1" "cv" "MA 2006" "22.1" "2.4" >> "2" "ot" " " " " " " >> "2" "wt" " " " " " " >> "2" "rt" "MA 2005" >> "2" "gh" "MJ 2005" "32.3" "23.5" >> "2" "bg" "JA 2005" "52.4" "22.3" >> "2" "se" "SO 2005" "82.9" "22.5" >> "2" "cv" "ND 2005" " " "2.5" >> "2" "cv" "JF 2006" "332.4" " " >> "2" "cv" "MA 2006" "312.4" "21.5" >> end >> The above data set is a sample. >> Basically,I have 30000 individuals and instead of the last 2 columns >> that contain the numbers I have 29 such columns. >> >> The data set refers to bimontly values. >> >> Is there a way to convert the above data to montly data? >> Specifically, What I think is that first I have to split the dates as >> follows >> >> M/2005 >> A/2005 >> M/2005 >> J/2005 >> >> and so forth and then to convert them to >> >> 3/2005 >> 4/2005 >> 6/2005 >> and so forth. >> >> So regarding the first 3 columns I should get >> >> "1" "ot" " " >> "1" "wt" " " >> "1" "rt" "3/2005" >> "1" "rt" "4 2005" >> "1" "gh" "5/2005" >> "1" "gh" "6/2005" >> >> and so forth.I am not exactly sure how to handle the last two columns, >> though(numerical values) >> >> I think that one way would be to divide the bimonthly values by 2. Then I >> get >> >> "1" "ot" " " >> "1" "wt" " " >> "1" "rt" "3/2005" "32.4/2" "2.5/2" >> "1" "rt" "4 2005" "32.4/2" "2.5/2" >> "1" "gh" "5/2005" "82.3/5" "12.5/5" >> "1" "gh" "6/2005" "82.3/5" "12.5/5" >> >> I am not sure that this makes sense as I have repeated values for two >> consequtive months. >> >> Another way would be interpolation? >> >> Any code provided is greatly appreciated. > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: how to get monthly values from Bimonthly data***From:*Nick Cox <njcoxstata@gmail.com>

**References**:**st: how to get monthly values from Bimonthly data***From:*sabbas gidarokostas <sabbasgidarokostas@googlemail.com>

**Re: st: how to get monthly values from Bimonthly data***From:*Nick Cox <njcoxstata@gmail.com>

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