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- P J Diggle, A G Chetwynd, R Häggkvist, S E Morris
- Statistical methods in medical research
- 1995

We consider the problem of detecting and describing space-time interaction in point process data. We extend existing second-order methods for purely spatial point process data to the spatial-temporal setting. This extension allows us to estimate space-time interaction as a function of spatial and temporal separation, and provides a useful reinterpretation… (More)

- Amanda G. Chetwynd, Anthony J. W. Hilton
- Discrete Mathematics
- 1989

It is a well-known conjecture that if a regular graph G of order 2n has degree d(G) satisfying d(G) ^ n, then G is the union of edge-disjoint 1-factors. It is well known that this conjecture is true for d(G) equal to 2n —1 or 2n — 2. We show here that it is true for d(G) equal to2n — 3, In — 4, or2n — 5. We also show that it is true for </(G)>$|K(G)|.

- P J Diggle, A G Chetwynd
- Biometrics
- 1991

Motivated by recent interest in the possible spatial clustering of rare diseases, the paper develops an approach to the assessment of spatial clustering based on the second-moment properties of a labelled point process. The concept of no spatial clustering is identified with the hypothesis that in a realisation of a stationary spatial point process… (More)

- Amanda G. Chetwynd, Susan J. Rhodes
- Discrete Mathematics
- 1997

- Roland Häggkvist, Amanda G. Chetwynd
- Journal of Graph Theory
- 1992

In this paper we discuss some estimates for upper bounds on a number of chromatic parameters of a multigraph. In particular, we show that the total chromatic number for an n-order multigraph exceeds the chromatic index by the smallest t such that t ! > n.

- M I Prince, A Chetwynd, W L Craig, J V Metcalf, O F W James
- Gut
- 2004

BACKGROUND
Many patients with primary biliary cirrhosis (PBC) are asymptomatic at the time of diagnosis. However, because most studies of asymptomatic PBC have been small and from tertiary centres, asymptomatic PBC remains poorly characterised.
AIMS
To describe the features and progression of initially asymptomatic PBC patients.
METHODS
Follow up by… (More)

- Amanda G. Chetwynd, Hian Poh Yap
- Discrete Mathematics
- 1983

- Peter J. Cameron, Amanda G. Chetwynd, John J. Watkins
- Journal of Graph Theory
- 1987

- Chris R. Cardwell, Lars C. Stene, +25 authors Chris C. Patterson
- Diabetes
- 2010

OBJECTIVE
The aim if the study was to investigate whether children born to older mothers have an increased risk of type 1 diabetes by performing a pooled analysis of previous studies using individual patient data to adjust for recognized confounders.
RESEARCH DESIGN AND METHODS
Relevant studies published before June 2009 were identified from MEDLINE, Web… (More)