IDEAS home Printed from https://ideas.repec.org/a/sae/jedbes/v9y1984i3p227-236.html
   My bibliography  Save this article

On Two-Stage Multiple Comparison Procedures When there are Unequal Sample Sizes in the First Stage

Author

Listed:
  • Rand R. Wilcox

Abstract

A problem of considerable practical importance when applying multiple comparison procedures is that unequal variances can seriously affect power and the probability of a Type I error. A related problem is getting a precise indication of how many observations are required so that the length of the confidence intervals will be reasonably short. Two-stage procedures have been proposed that give an exact solution to these problems, the first stage being a pilot study for the purpose of obtaining sample estimates of the variances. However, the critical values of these procedures are available only when there are equal sample sizes in the first stage. This paper suggests a method of evaluating the experimentwise Type I error probability when the first stage has unequal sample sizes.

Suggested Citation

  • Rand R. Wilcox, 1984. "On Two-Stage Multiple Comparison Procedures When there are Unequal Sample Sizes in the First Stage," Journal of Educational and Behavioral Statistics, , vol. 9(3), pages 227-236, September.
    • Handle: RePEc:sae:jedbes:v:9:y:1984:i:3:p:227-236
    DOI: 10.3102/10769986009003227
    as

    Download full text from publisher

    File URL: https://journals.sagepub.com/doi/10.3102/10769986009003227
    Download Restriction: no
    File URL: https://libkey.io/10.3102/10769986009003227?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:sae:jedbes:v:9:y:1984:i:3:p:227-236. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: SAGE Publications (email available below). General contact details of provider: .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.