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From |
Maarten Buis <[email protected]> |

To |
[email protected] |

Subject |
Re: st: predicting height by age for each individual |

Date |
Thu, 30 Jan 2014 16:47:22 +0100 |

I have two comments: As a father I can tell you that height does not change linearly with age in that period. You might want to look at -fp- in order to create a reasonable model. Imangine what happens in your code when you have three persons. Your first regression will fill in for person 2 and 3, your second regression will be used to fill in 1 and 3, but wait.. you already filled in for person 3. What do you want to do in that case? -- Maarten On Thu, Jan 30, 2014 at 4:26 PM, Y.R.E. Retamal <[email protected]> wrote: > Dear STATA users > > I am studying growth and development in children from 0 to 3 years old. I am > using a longitudinal database of children where height and weight were > measured from birth to three years old (1600 children). > I would like to predict height of each child from birth until three years > old for each six months (birth, 6, 12, 18, ..., 36 month), after running a > linear regression of height by age for each child, not all at the same time. > For example, I have the following database: > > id month height > 1 0 59 > 1 6 68 > 1 12 70 > 1 18 74 > 1 24 81 > 1 30 86 > 1 36 94 > 2 0 50 > 2 6 55 > 2 12 74 > 2 18 80 > 2 24 82 > 2 30 87 > 2 36 95 > > > I could do: > reg height month if id==1 > predict xb if id!=1 > reg height month if id==2 > predict xb if id!=2 > > and so... > > But, I have 1600 children, therefore I should write the same commands per > each child (1600 times), something truly inefficient and tedious. There is a > command or program to run the same commands, but automatically? > > > Any help would be very appreciated. > Rodrigo > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/statalist-faq/ > * http://www.ats.ucla.edu/stat/stata/ -- --------------------------------- Maarten L. Buis WZB Reichpietschufer 50 10785 Berlin Germany http://www.maartenbuis.nl --------------------------------- * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: predicting height by age for each individual***From:*"Y.R.E. Retamal" <[email protected]>

**References**:**st: WTP distribution with LN Cost coefficient***From:*"Heidi Pitts" <[email protected]>

**st: predicting yhat of height for each individual at different ages***From:*"Y.R.E. Retamal" <[email protected]>

**st: predicting height by age for each individual***From:*"Y.R.E. Retamal" <[email protected]>

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