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Comparing the performance of two indices for spatial model selection: Application to two mortality data

, : Comparing the performance of two indices for spatial model selection: Application to two mortality data. Statistics in Medicine 19(14): 1915-1930, 30 July

The statistical analysis of spatially correlated data has become an important scientific research topic lately. The analysis of the mortality or morbidity rates observed at different areas may help to decide if people living in certain locations are considered at higher risk than others. Once the statistical model for the data of interest has been chosen, further effort can be devoted to identifying the areas under higher risks. Many scientists, including statisticians, have tried the conditional autoregressive (CAR) model to describe the spatial autocorrelation among the observed data. This model has greater smoothing effect than the exchangeable models, such as the Poisson gamma model for spatial data. This paper focuses on comparing the two types of models using the index LG, the ratio of local to global variability. Two applications, Taiwan asthma mortality and Scotland lip cancer, are considered and the use of LG is illustrated. The estimated values for both data sets are small, implying a Poisson gamma model may be favoured over the CAR model. We discuss the implications for the two applications respectively. To evaluate the performance of the index LG, we also compute the Bayes factor, a Bayesian model selection criterion, to see which model is preferred for the two applications and simulation data. To derive the value of LG, we estimate its posterior mode based on samples derived from the BUGS program, while for Bayes factor we use the double Laplace-Metropolis method, Schwarz criterion, and a modified harmonic mean for approximations. The results of LG and Bayes factor are consistent. We conclude that LG is fairly accurate as an index for selection between Poisson gamma and CAR model. When easy and fast computation is of concern, we recommend using LG as the first and less costly index.


PMID: 10867680

DOI: 10.1002/1097-0258(20000730)19:14<1915::aid-sim503>;2-m

Other references

Overton, A.A.; Olson, K.H.; Pellegrini, J.J., 1996: Decline in lateral pinch strength and steadiness with age. Society for Neuroscience Abstracts 22(1-3): 183

Xing, J.; Witherspoon, D.J.; Watkins, W.Scott.; Zhang, Y.; Tolpinrud, W.; Jorde, L.B., 2008: HapMap tagSNP transferability in multiple populations: general guidelines. Linkage disequilibrium (LD) has received much attention recently because of its value in localizing disease-causing genes. Due to the extensive LD between neighboring loci in the human genome, it is believed that a subset of the single nucleotide...

Churchill, S.; Redfearn, P.J.; Ikenberry, G., 1982: Contributions to the Oklahoma moss flora. Bryologist er (pub 1982) 84(4): 498-504

Jones, M Elizabeth; Barber, P.H., 2005: Characterization of microsatellite loci for the detection of temporal genetic shifts within a single cohort of the brown demoiselle, Neopomacentrus filamentosus. Neopomacentrus filamentosus, a common damselfish on the Indo-Australian archipelago, undergoes significant shifts in size and mitochondrial genetic structure upon larval settlement and metamorphosis to juvenile stages. We characterized five polymo...

Zemann J., 1989: Crystal chemistry of magnesium carbonates and related compounds. Monograph Series on Mineral Deposits 28: 241-257

Schinzel, R.; Wagner, Z.; Bahner, U.; Hennemann, H.; Klassen, A.; Boege, F.; Vienken, J.; Heidland, A., 2002: Different rebound kinetics of the AGE-CML and AGE-associated fluorescence after hemodialysis. Nephrology Dialysis Transplantation 17(Abstracts Supplement 1): 158-159

Hendry, S.H.; Jones, E.G.; Burstein, N., 1988: Activity-dependent regulation of tachykinin-like immunoreactivity in neurons of monkey visual cortex. A monoclonal antibody that recognizes the carboxyl terminus of substance P was used to localize tachykinin-like immunoreactivity in neurons of area 17 of the adult monkey cerebral cortex. Tachykinin immunostaining was examined in normal monkeys, i...

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Sieburth, J.M.; Frey, J.A.; Conover, J.T., 1963: Microbiological sampling with a piggy-back device during routine Nansen bottle casts. Each Nansen bottle is fitted with a collar that holds a sterile bulb which is collapsed and plugged. The plug is loosely connected to the hydrographic wire with a chain and hook. As the free end of the tripped Nansen bottle falls, the plug is jerk...

Kwan Julian S.H.; Sun H.W., 2006: An improved landslide mobility model. A relatively simple and versatile numerical model known as DAN, developed by Oldrich Hungr for the assessment of landslide mobility, has been enhanced to incorporate the consideration of a trapezoidal-shaped flow channel for more realistic modelli...