Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.

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

From |
Kate Schneider <schneider.kate1@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Replace with returned results in svy loop |

Date |
Sun, 29 May 2011 16:40:24 -0700 |

Also, we have amended our code based on your recommendations but are getting a "type mismatch error" Here is what we're trying: foreach X of varlist $fooditemall { quietly count if `X'==1 & priceperkilo !=. if `r(N)'>0 { display "Variable is: " "`X'" svy, subpop(`X'): mean priceperkilo mat meanpriceperkilo = e(b) scalar vmean = meanpriceperkilo[1,1] } quietly count if `X'==1 & priceperkilo ==. if `r(N)'>0 { replace priceperkilo = varmean if `X'==1 & priceperkilo ==. } } Thanks so much for any advice! On Sun, May 29, 2011 at 4:27 PM, Kate Schneider <schneider.kate1@gmail.com> wrote: > Thanks so much Richard, > > We are trying to monetize own consumption of food items, so the mean > we are calculating is the average price reported by households who > bought the food and we want to apply this to the missing data. > Observations are missing where households ate food they produced > themselves or did not report the price they paid for the item if they > bought it. > > Is there a better way you recommend attributing these prices to the > cases where we don't have a value? We were previously manually keeping > track of the mean prices and then manually telling stata to replace > (for example) price_eggs == $1 if price_eggs==. We are trying to avoid > manually going between excel and stata, thinking that it would be more > valid to have stata do all of this for us. > > The other approach we were considering would be to create a new > variable where every observation of eggs get the mean egg price value, > and then when we calculate the total value of egg consumption to > specify drawing from the reported price if not missing, and if missing > use the new value. Does that sound like a more valid approach? > Regardless when we use ereturn list, there isn't a scalar listed for > our mean. We tried e(mean), but it returned an error. Do we have to > tell stata to store e(mean) before our svy: mean calculation? > > The other thing we should specify is that our data is hierarchical > with 2 unique identifiers, a household ID and an id for each of the 65 > different food items. We are trying to value total consumption per > food item and also per household. We thought about collapsing food > items to their mean price, but thought that probably wouldn't apply > our survey weights (though perhaps stata is smarter than we are?). > > Thanks so much for your assistance, we are really grateful! > > Kate > > On Sun, May 29, 2011 at 5:11 PM, Richard Williams > <richardwilliams.ndu@gmail.com> wrote: >> If in doubt where a value is stored, type -ereturn list- after the >> estimation command. After -mean-, e(b) has the mean of the variable. So, to >> get the mean stored in a scalar, do something like >> >> webuse nhanes2f, clear >> svy: mean houssiz >> mat varmean = e(b) >> scalar vmean = varmean[1,1] >> >> Having said that, substituting the mean for missing data is generally not >> considered the best practice in the world. And, there may be other errors in >> your code (e.g. the == in the replace command looks wrong) but I imagine >> those will become obvious once you tidy other things up. >> >> At 03:11 PM 5/29/2011, Kate Schneider wrote: >>> >>> Hello, >>> Sorr to bug everyone on a holiday weekend, but we're a graduate >>> student research group at the University of Washington working with a >>> large household survey dataset and have come up against some trouble. >>> >>> We're trying to replace missing values of a variable with the results >>> of some other operation we've just performed (basically, a mean). >>> Right now, we're having trouble with the replace component of the >>> below operation. Does anyone know how torecall the previous command's >>> results from the svy calculation and use that data to replace missing >>> in a loop? Is this possible with survey data? >>> >>> foreach X of varlist $fooditemall { >>> quietly count if `X'==1 & priceperkilo !=. >>> if `r(N)'>0 { >>> display "Variable is: " "`X'" >>> svy, subpop(`X'): mean priceperkilo >>> } >>> quietly count if `X'==1 & priceperkilo ==. >>> if `r(N)'>0 { >>> replace priceperkilo == e(????) if `X'==1 & priceperkilo ==. >>> } >>> } >>> >>> Thanks for your insight! If you need more information please let me know. >>> Kate >>> >>> * >>> * 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/ >> >> ------------------------------------------- >> Richard Williams, Notre Dame Dept of Sociology >> OFFICE: (574)631-6668, (574)631-6463 >> HOME: (574)289-5227 >> EMAIL: Richard.A.Williams.5@ND.Edu >> WWW: http://www.nd.edu/~rwilliam >> >> * >> * 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/

**References**:**st: Replace with returned results in svy loop***From:*Kate Schneider <schneider.kate1@gmail.com>

**Re: st: Replace with returned results in svy loop***From:*Richard Williams <richardwilliams.ndu@gmail.com>

**Re: st: Replace with returned results in svy loop***From:*Kate Schneider <schneider.kate1@gmail.com>

- Prev by Date:
**Re: st: Replace with returned results in svy loop** - Next by Date:
**Re: st: Replace with returned results in svy loop** - Previous by thread:
**Re: st: Replace with returned results in svy loop** - Next by thread:
**Re: st: Replace with returned results in svy loop** - Index(es):