Fig. 4From: Association of spring-summer hydrology and meteorology with human West Nile virus infection in West Texas, USA, 2002–2016Rootogram [89] comparing the fit of Poisson regression and negative-binomial regression. Left panel negative-binomial, right panel Poisson. The negative-binomial fit shows marked reductions in over-fit and under-fit, especially for counts of zero and counts of 1Back to article page