The Infant Mortality Rates in 34 sub-Saharan countries are examined in this paper by means of focusing on the degree of persistence and non-linearities. The results indicate that half of the countries examined display non-linearities and the orders of integration are extremely large in all cases, being around 2 in the majority of them. Looking at the growth rate series, we observe significant negative trends in three countries: Chad, Equatorial Guinea and Mozambique, and evidence of mean reversion, and thus, transitory shocks, in the cases of Lesotho, Rwanda, Botswana and Mozambique. As expected, time dynamics of IMR and its growth rates are expected to be persistent in order to ascertain the decline in mortality rates. Serious government interventions are therefore required in health management of infants in those listed countries.

中文翻译：

---

模拟非洲国家婴儿死亡率的长期依赖性和非线性

本文通过关注持续性和非线性程度来研究 34 个撒哈拉以南国家的婴儿死亡率。结果表明，被调查的国家中有一半显示非线性，并且在所有情况下积分阶数都非常大，其中大多数约为 2。从增长率序列来看，我们观察到三个国家的显着负面趋势：乍得、赤道几内亚和莫桑比克，以及莱索托、卢旺达、博茨瓦纳和莫桑比克均值回归的证据，因此是短暂的冲击。正如预期的那样，IMR 的时间动态及其增长率预计将持续存在，以确定死亡率的下降。因此，在所列国家，政府需要对婴儿的健康管理进行严肃的干预。