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From |
Steven Joel Hirsch Samuels <sjhsamuels@earthlink.net> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: question about weights in histograms |

Date |
Wed, 10 Oct 2007 13:03:06 -0400 |

Good call, Austin! All multiples of the original weight will give the same result for means and percentages.

-Steve

On Oct 10, 2007, at 12:44 PM, Austin Nichols wrote:

Or, better, multiply the weight by the reciprocal of the smallest

increment ("units" in -codebook- output) and use that as a frequency

weight, which should give you identical point estimates to -svy-

output:

use hhinc mars using cpsmar07

g double wt=round(marsupwt*100)

hist hhinc [fw=wt], xscale(log) percent

On 10/10/07, Steven Joel Hirsch Samuels <sjhsamuels@earthlink.net> wrote:

Round the weights to the nearest integer and use these as frequency weights. -histogram- is not a survey command and so is unaffected by -svyset-. The results will be nearly identical to what you would get if you estimated the per cent in each category using -svy: proportion-. By the way, in most complex surveys the weights have been trimmed to reduce total error: bias^2 + se^2. So you cannot expect 'unbiased' estimates even with the original weights. -Steve On Oct 10, 2007, at 12:02 PM, Scott Cunningham wrote:I am using 5% Census and March CPS data (United States) to construct histograms. These data include probability weights. I know that histogram can adjust for frequency weights, but apparently not explicitly for probability weights that are not integers. If I -svyset- the data using the perweight, will -histogram- construct unbiased estimates of the population? Here is my code . svyset [perweight=perwt] . histogram tax, by(white, col(1)) percent* * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

Steven Samuels sjhsamuels@earthlink.net 18 Cantine's Island Saugerties, NY 12477 Phone: 845-246-0774 EFax: 208-498-7441 * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: question about weights in histograms***From:*"Scott Cunningham" <scunning@gmail.com>

**References**:**st: question about weights in histograms***From:*"Scott Cunningham" <scunning@gmail.com>

**Re: st: question about weights in histograms***From:*Steven Joel Hirsch Samuels <sjhsamuels@earthlink.net>

**Re: st: question about weights in histograms***From:*"Austin Nichols" <austinnichols@gmail.com>

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