Notice: On March 31, it was **announced** that Statalist is moving from an email list to a **forum**. The old list will shut down on April 23, and its replacement, **statalist.org** is already up and running.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: how to do a weighted transition matrix |

Date |
Fri, 29 Apr 2011 18:54:45 +0100 |

Thanks for the detail. From what you tell us, I gather that the weighted matrix of transition frequencies is just the actual matrix multiplied by the constant. The transition probabilities are unaffected by a multiplicative constant. Nick On Fri, Apr 29, 2011 at 5:37 PM, Hey Sky <heyskywalker@yahoo.com> wrote: > Dear Nick > > thanks for your reply. > > my research topic is about the transition probability from one state to another, > e.g., white/blue collar job and self-employment within an unbalanced panel. all > the three states are mutural exclusive dummy variables. the weight is a constant > number but not integer. it adjust the percentage of different people groups, > e.g., there is too many refugee in the survey but less other immigrants so that > the stats bureau uses the weight to adjust it back to represent the real world. > > > the following created data are almost the same with the actural one, though I am > not sure about the value of the weight. I checked it once long time ago and > vaguely remember it is just a constant number (I cannot check not due to the > data is not at hand). I used xttrans to get the transition matrix but I have > been required to use weights otherwise I cannot take the results to the public. > > > hope I make my question clear and thanks for any suggetsions. > > clear > input id time w b s weight > 1 1 1 0 0 1.8 > 1 2 1 0 0 1.8 > 1 3 0 1 0 1.8 > 2 1 0 1 0 1.8 > 2 2 0 1 0 1.8 > 2 3 0 0 1 1.8 > 3 1 0 0 1 1.8 > 3 2 0 1 0 1.8 > 3 3 . . . 1.8 > 4 1 0 0 1 1.8 > 4 2 0 1 0 1.8 > 4 3 1 0 0 1.8 > end > > > Nan > from Montreal > > > > > ----- Original Message ---- > From: Nick Cox <njcoxstata@gmail.com> > To: statalist@hsphsun2.harvard.edu > Sent: Fri, April 29, 2011 12:06:46 PM > Subject: Re: st: how to do a weighted transition matrix > > More explanation would help. Where do the weights come from? Do they > weight the transitions? The earlier state? The later state? Are they > integers or not? What is your data structure? Which variables hold > which information? Do you expect a precise answer to a vague question? > > At its easiest, this sounds like a transition matrix multiplied > elementwise by a weights matrix, so save the matrices independently > and do the multiplication in Mata. > > Nick > > On Fri, Apr 29, 2011 at 4:57 PM, > Nan from Montreal, a.k.a. Hey Sky > <heyskywalker@yahoo.com> wrote: > >> I have to do a weighted transition matrix but it is not an option for the >> command xttrans. >> >> I have searched the archives but did not find any discussion about >> this question. >> did anyone experience this before and any (other) method to deal with it? > > * > * 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/ > * * 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 do a weighted transition matrix***From:*Hey Sky <heyskywalker@yahoo.com>

**References**:**st: how to do a weighted transition matrix***From:*Hey Sky <heyskywalker@yahoo.com>

**Re: st: how to do a weighted transition matrix***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: how to do a weighted transition matrix***From:*Hey Sky <heyskywalker@yahoo.com>

- Prev by Date:
**Re: st: st_numscalar to pass a calculation result from Mata to Stata** - Next by Date:
**Re: st: new command to calculate 2006 WHO anthropometric z-scores** - Previous by thread:
**Re: st: how to do a weighted transition matrix** - Next by thread:
**Re: st: how to do a weighted transition matrix** - Index(es):