Skip Navigation

This Article
Right arrow Full Text Freely available
Right arrow FREE Full Text (PDF ) Freely available
Right arrow Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when eLetters are posted
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrow Search for citing articles in:
ISI Web of Science (13)
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by James, W. H.
Right arrow Articles by Walters, D.E.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by James, W. H.
Right arrow Articles by Walters, D.E.
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Human Reproduction, Vol. 15, No. 5, 1206-208, May 2000
© 2000 European Society of Human Reproduction and Embryology

Letters to the editor

Analysing data on the sex ratio of human births by cycle day of conception

William H. James

The Galton Laboratory, University College London, Wolfson House, 4 Stephenson Way, London NW1 2HE, UK

Walters (2000) is correct: pooling data from a set of 2x2 frequency tables is (except under some conditions) invalid. Whether these conditions are fulfilled in the present instance will not be discussed though (as will be seen) they may be suspected of being approximated. He describes a method for simultaneously analysing a number of such tables where there is heterogeneity of unknown origin. In the present case, I suggest that the origin of the heterogeneity may be identified, and that a different form of analysis is appropriate and valid.

. . . [Full Text of this Article]

References

D.E. Walters

Thorpes, The Grip, Linton, Cambridge CB1 6NR, UK


Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 J EndocrinolHome page
W. H James
Evidence that mammalian sex ratios at birth are partially controlled by parental hormone levels around the time of conception
J. Endocrinol., July 1, 2008; 198(1): 3 - 15.
[Abstract] [Full Text] [PDF]

Home page
 Proc R Soc BHome page
E. Z Cameron, P. R Lemons, P. W Bateman, and N. C Bennett
Experimental alteration of litter sex ratios in a mammal
Proc R Soc B, February 7, 2008; 275(1632): 323 - 327.
[Abstract] [Full Text] [PDF]

Home page
 Hum ReprodHome page
W. H. James
Further evidence that mammalian sex ratios at birth are partially controlled by parental hormone levels around the time of conception
Hum. Reprod., June 1, 2004; 19(6): 1250 - 1256.
[Abstract] [Full Text] [PDF]

Home page
 Hum ReprodHome page
W. H. James
'Over-ripeness ovopathy, sex ratio increase and sex ratio reversal a challenging hypothesis for sex ratio modulation': An alternative interpretation
Hum. Reprod., April 1, 2004; 19(4): 775 - 777.
[Abstract] [Full Text] [PDF]

Home page
 Hum ReprodHome page
W. H. James
Sex ratios of births conceived during wartime
Hum. Reprod., May 1, 2003; 18(5): 1133 - 1134.
[Full Text] [PDF]

Home page
 Hum ReprodHome page
W. H. James
The causes of the excess males among pre-term and post-term births
Hum. Reprod., March 1, 2003; 18(3): 655 - 656.
[Full Text] [PDF]

Home page
 BMJHome page
W. H James and I. Banks
The fragile male
BMJ, March 10, 2001; 322(7286): 617a - 617.
[Full Text]

Home page
 Hum ReprodHome page
W. H. James
Why are boys more likely to be preterm than girls? Plus other related conundrums in human reproduction: Opinion
Hum. Reprod., October 1, 2000; 15(10): 2108 - 2111.
[Abstract] [Full Text] [PDF]