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Let $(X_{i}, i\in J)$ be a family of locally dependent nonnegativeinteger-valued random variables, and consider the sum $W=\sum\nolimits_{i\inJ}X_i$. We first establish a general error upper bound for $d_{TV}(W, M)$ usingStein's method, where the target variable $M$ is either the mixture of Poissondistribution and binomial or negative binomial distribution. As applications,we attain $O(|J|^{-1})$ error bounds for ($k_{1},k_{2}$)-runs and $k$-runsunder some special cases. Our results are significant improvements of theexisting results in literature, say $O(|J|^{-0.5})$ in Pek\"{o}z [Bernoulli, 19(2013)] and $O(1)$ in Upadhye, et al. [Bernoulli, 23 (2017)].

Approximation of Sums of Locally Dependent Random Variables via Perturbation of Stein Operator