1 / 9

Sample enumeration: Forecasting from statistical models

Sample enumeration: Forecasting from statistical models . Dr Vernon Gayle and Dr Paul Lambert (Stirling University) Tuesday 29th April 2008. Communicating Results (to non-technically informed audiences). Davies (1992) Sample Enumeration Payne (1998) Labour Party campaign data

suzette
Télécharger la présentation

Sample enumeration: Forecasting from statistical models

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Sample enumeration: Forecasting from statistical models Dr Vernon Gayle and Dr Paul Lambert (Stirling University) Tuesday 29th April 2008

  2. Communicating Results (to non-technically informed audiences) • Davies (1992) Sample Enumeration • Payne (1998) Labour Party campaign data • Gayle et al. (2002) • War against the uninformed use of odds (e.g. on breakfast t.v.)

  3. Sample Enumeration Methods In a nutshell… “What if” – what if the gender effect was removed 1. Fit a model (e.g. logit) 2. Focus on a comparison (e.g. boys and girls) 3. Use the fitted model to estimate a fitted value for each individual in the comparison group 4. Sum these fitted values and construct a sample enumerated % for the group

  4. Naïve Odds • Naïvely presenting odds ratios is widespread (e.g. Connolly 2006) • In this model naïvely (after controlling for other factors) Girls have an odds of 1.0 Boys have an odds of .58 We should avoid this where possible!

  5. Logit Model • Example from YCS 11 (these pupils took GCSE in 2001) y=1 5+ GCSE passes (A* - C) X vars gender; family social class (NS-SEC); ethnicity; housing tenure; parental education; parental employment; school type; family type

  6. Naïve Odds • Example from YCS 11 (these pupils took GCSE in 2001) • In this model naïvely (after controlling for other factors) Girls have an odds of 1.0 Boys have an odds of .66 We should avoid this where possible!

  7. Sample Enumeration Results

  8. Pseudo Confidence Interval Bootstrapping to construct a pseudo confidence interval (1000 Replications)

  9. Reference • A technical explanation of the issue is given in Davies, R.B. (1992) ‘Sample Enumeration Methods for Model Interpretation’ in P.G.M. van der Heijden, W. Jansen, B. Francis and G.U.H. Seeber (eds) Statistical Modelling, Elsevier.

More Related