Comments on the paper “Bias-adjustment and calibration of jackknife variance estimator in the presence of non-response”

Singh and Arnab (2010) presented a bias adjustment to the jackknife variance estimator of Rao and Sitter (1995) in the presence of non-response. In their paper, they obtained a second-order approximation of the bias of the Rao-Sitter variance estimator and then proposed a bias-adjusted estimator based on this approximation. To compare their proposed variance estimator to various other variance estimators, they performed a simulation study and showed that their variance estimator is superior to the Rao-Sitter variance estimator. In fact they showed that the Rao-Sitter variance estimator suffers from severe underestimation. These results contradict those in the literature, which indicate that the Rao-Sitter variance estimator suffers from a positive bias if the sampling fractions are not negligible; see Rao and Sitter (1995), Lee et al. (1995) and Haziza and Picard (2011). Because of this contradiction, we felt that a further investigation was warranted. In this paper, we attempt to recreate the results of Singh and Arnab (2010) and, in fact, show that their second order approximation to the bias of the Rao-Sitter variance estimator is incorrect and that their simulation results are also questionable.     

Maybe ignorance is not always bliss: The disparate treatment of Hispanics within the child welfare system

Previous studies indicate that the proportion of culturally diverse children to White children is increasing in public social service agencies. In addition, culturally diverse children are more likely to receive more intensive and punitive services, are more likely to stay within the system for longer periods of time and are reported more often to Child Protective Services. The purpose of the study was to explore how child welfare practices with Hispanic children are different from those applied with White non-Hispanic children. This study was a retrospective, two year, longitudinal, survival analysis of differential child welfare placement outcomes of White non-Hispanic and Hispanic children/families which had substantiated cases of abuse/neglect (n=1001).Findings demonstrate that although cases reported for abuse/neglect are relatively proportionate between Hispanic and White non-Hispanic children, substantiated cases are more likely to occur with Hispanic children. These children are more likely to be placed out of the home more quickly and for longer periods of time than their White non-Hispanic counterparts. The current study demonstrates the need for increased cultural awareness among Child Welfare professionals, especially in terms of assessment and case decision making, and the need for the development of culturally sensitive training modules for CPS and case management personnel.     

Relationship of perceived future opportunity to depressive symptomatology of inner-city African-American adolescents

This study investigated the relationship of perceived future opportunities to level of depressive symptomatology in a sample of 173 adolescents attending inner city non-public schools in a large city in the northeastern region of the United States. Standard multiple regression analysis revealed that lower perceived future opportunity for both females (MR = .37, R²= .13, Beta =−.29) and males (MR = .39, R² = .15, Beta = −.41) were significantly associated with higher levels of depressive symptomatology. Secondary findings showed 46% of African-American students were in the at-risk category for depression and almost a third of students (30%) reported lower levels of perceived future opportunities. Future longitudinal studies are suggested to examine the temporal and casual relationships of perceived future opportunities to depression. Implications for social work policy and practice to improve future opportunities for disadvantaged African-American youth are discussed.