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From |
Nick Cox <njcoxstata@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

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

Date |
Tue, 31 Jul 2012 09:58:37 -0500 |

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/

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

**st: Problems insheeting long variable names***From:*"Daniel Brodback" <schmani@gmx.de>

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

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