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  • Evaluación de métodos de clustering para el pronóstico de ventas en empresas productoras y distribuidoras de alimentos procesados

    Bouillón Sardón, Adolfo Gabriel; Hidalgo Cornejo, Ivan Luis Manuel; Solano Barragán, Patricio Alonso (Universidad Peruana de Ciencias Aplicadas (UPC)PE, 2019-07-23)
    Tener un acertado pronóstico de ventas es un tema indispensable en empresas productoras y distribuidoras, ya que impacta positivamente en la toma de decisiones relacionadas a la demanda, gestión de inventario, abastecimiento, distribución y surtido de productos, así como otras áreas del negocio como finanzas, marketing, operaciones y servicio al cliente. Sin embargo, actualmente, en la mayoría de los casos, las predicciones de las ventas se basan en análisis individuales de los productos, mas no en técnicas de clustering, las cuales permitirían reducir el error y ser más acertados en sus pronósticos. Por ello, el presente trabajo propone evaluar y comparar el impacto de la precisión de los pronósticos de ventas del método tradicional, regresión lineal simple con series de tiempo, con los métodos de clustering k-means y Ward. El alcance de la investigación será a los cinco principales productos de una importante empresa productora y distribuidora de alimentos procesados en el Perú. Los indicadores que se utilizarán para identificar el método más preciso serán los errores medios absolutos (MAD) y errores cuadráticos medios (MSE) resultantes.
    Acceso abierto
  • Perception about chagas disease and the risk of oral transmission in Andoas, Loreto, Peru

    Cabrera, Rufino; Valderrama, Yadira; Meza, Juan Ramón (Instituto Nacional de Salud, 2020-01-01)
    Carta al editor.
    Acceso abierto
  • Novel 2019 coronavirus infection in children

    Llaque Quiroz, Patricia Beatriz (Instituto Nacional de Salud, 2020-01-01)
    COVID-19 is rarely reported in children and they are mildly affected in most cases. The most common clinical presentation of COVID-19 is cough, fever and sore throat; severe cases show tachypnea. The course of the disease is from one to two weeks. Laboratory findings are nonspecific; lymphopenia, elevation of C-reactive protein and procalcitonin have been described. Early chest X-ray is usually normal, and the most common tomographic findings are consolidations with halo, ground-glass opacities and tiny nodules which mainly affects subpleural areas. Management of the disease is supportive; in severe cases, it should be focused on respiratory support. It is recommended to limit the handling of respiratory secretions and to follow the same preventive measures provided to adults.
    Acceso abierto
  • Let’s Talk About Sex: The Impact of Partnership Contexts on Communication About HIV Serostatus and Condom Use Among Men Who Have Sex with Men (MSM) and Transgender Women (TW) in Lima, Peru

    Ayer, Amrita; Perez-Brumer, Amaya; Segura, Eddy R.; Chavez-Gomez, Susan; Fernandez, Rosario; Arroyo, Cecilia; Barrantes, Alex; Lake, Jordan E.; Cabello, Robinson; Clark, Jesse L. (Springer, 2021-01-01)
    Sexual communication with partners informs risk assessment and sexual practices. We evaluated participant, partner, and network factors associated with communication about condom use and HIV serostatus and explored their relationships with condomless anal intercourse (CAI) among 446 men who have sex with men (MSM) and 122 transgender women (TW) in Lima, Peru. Generalized estimating equations assessed contextual influences on communication and practices with recent sexual partners. More frequent HIV communication was reported by MSM who: identified as heterosexual, compared to bisexual or gay; characterized partnerships as stable, compared to casual, anonymous, or commercial; or discussed HIV/STIs with close social contacts (p < 0.05). TW in concurrent partnerships discussed condom use more frequently than those in monogamous relationships (p < 0.05). Condom use discussions and alcohol use among MSM were associated with CAI (p < 0.05). Findings highlight complexity in sexual decision-making and call for further study of conversation content and practices to inform HIV prevention messaging.
    Acceso restringido temporalmente
  • Coronavirus Anxiety Scale: New psychometric evidence for the Spanish version based on CFA and IRT models in a Peruvian sample

    Caycho-Rodríguez, Tomás; Vilca, Lindsey W.; Carbajal-León, Carlos; White, Michael; Vivanco-Vidal, Andrea; Saroli-Araníbar, Daniela; Peña-Calero, Brian Norman; Moreta-Herrera, Rodrigo (Routledge, 2021-01-01)
    The aim of the study was to analyze the psychometric properties of the Spanish version of the Coronavirus Anxiety Scale (CAS), using Item Response Theory (IRT) and Confirmatory Factor Analysis (CFA). The participants were 790 Peruvians, selected through a convenience sampling, where the majority were women. The CFA models indicated that the one-dimensional structure better represents the data, is reliable and invariant between men and women. Likewise, IRT findings indicate that CAS is more informative for high levels of COVID-19 anxiety. The CAS in Spanish has adequate psychometric properties to be used as a short measure of COVID-19 anxiety.
    Acceso abierto

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