Drafts by Marco Rodriguez
Cada vez que realicemos una inversión esta demanda capital. Una empresa necesita atraer inversion... more Cada vez que realicemos una inversión esta demanda capital. Una empresa necesita atraer inversionistas que adquieran acciones de la compañía, que son las empresas que cotizan en bolsa de valores, ofreciéndoles cierto monto de rentabilidad, lo que genera un costo para la compañía llamado el "costo de capital", cierta rentabilidad se ve ofrecida a los accionistas por medio de dividendos, que es un cierto porcentaje de las utilidades repartido entre los accionistas, siendo una especie de ahorro e inversión entre los inversionistas y accionistas de la compañía . Esta compra y venta de títulos accionarios se conoce como mercado de capitales. (Millán & Montilla, 2014) DESARROLLO En los estudios financieros conseguir una mezcla adecuada de rentabilidad respecto al nivel de riesgo, es uno de los problemas más grandes que se presentan. Se ha logrado establecer que cuando se cuenta con un histórico del comportamiento, y realizar un análisis de este es posible llegar a una aproximación haciendo pronósticos futuros, esto con el fin de tomar las mejores decisiones. En la administración de portafolios de inversión, aplicar herramientas cuantitativas es aún más confiable ya que existen grandes bases de datos históricos que nos
Papers by Marco Rodriguez
Bipolar Disorders, 2016
Recent genome-wide association studies (GWASs) have identified numerous putative genetic polymorp... more Recent genome-wide association studies (GWASs) have identified numerous putative genetic polymorphisms associated with bipolar disorder (BD) and/or schizophrenia (SC). We hypothesized that a portion of these polymorphisms would also be associated with BD in the Latino American population. To identify such regions, we tested previously identified genetic variants associated with BD and/or SC and ancestral haploblocks containing these single nucleotide polymorphisms (SNPs) in a sample of Latino subjects with BD. A total of 2254 Latino individuals were genotyped for 91 SNPs identified in previous BD and/or SC GWASs, along with selected SNPs in strong linkage disequilibrium with these markers. Family-based single marker and haplotype association testing was performed using the PBAT software package. Empirical P-values were derived from 10 000 permutations. Associations of eight a priori GWAS SNPs with BD were replicated with nominal (P≤.05) levels of significance. These included SNPs within nuclear factor I A (NFIA), serologically defined colon cancer antigen 8 (SDCCAG8), lysosomal associated membrane protein 3 (LAMP3), nuclear factor kappa B subunit 1 (NFKB1), major histocompatibility complex, class I, B (HLA-B) and 5'-nucleotidase, cytosolic II (NT5C2) and SNPs within intragenic regions microRNA 6828 (MIR6828)-solute carrier family 7 member 14 (SLC7A14) and sonic hedgehog (SHH)-long intergenic non-protein coding RNA 1006 (LINC01006). Of the 76 ancestral haploblocks that were tested for associations with BD, our top associated haploblock was located in LAMP3; however, the association did not meet statistical thresholds of significance following Bonferroni correction. These results indicate that some of the gene variants found to be associated with BD or SC in other populations are also associated with BD risk in Latinos. Variants in six genes and two intragenic regions were associated with BD in our Latino sample and provide additional evidence for overlap in genetic risk between SC and BD.
A fluid flow model for the Cerro Prieto 1 area (CP1) has been updated, on the basis of reservoir ... more A fluid flow model for the Cerro Prieto 1 area (CP1) has been updated, on the basis of reservoir engineering and production data collected since 1973. Two reservoirs have been identified in the CP1 area, the shallow alpha and the deeper beta reservoir which extends over the entire field. Due to 28 years of continuous exploitation and the existence of
Ecology, 2002
The ''restricted-movement paradigm'' (RMP) states that adult fish in streams are sedentary and sp... more The ''restricted-movement paradigm'' (RMP) states that adult fish in streams are sedentary and spend most of their lives in short (20-50 m) reaches of stream. In markrecapture studies, however, many fish initially marked are often never recaptured. As well, turnover rates of individuals in the home section (where fish were originally marked) can be high when marked fish moving out are rapidly replaced by unmarked ones. Recent challenges to the RMP have been based on the inference that high turnover indicates high mobility. However, when the home section is small many individuals may leave (high turnover) but not move far away (low displacement). I present two models for the frequency distribution of displacement distances: one represents populations as homogeneous ensembles with a single mobility parameter; the second represents populations as a mixture of stationary and mobile individuals. Both readily distinguish the turnover and displacement components of movement and show that high turnover rate is compatible with low displacement. The models were then fit to dispersal curves for six species of stream salmonids in 27 populations. Empirical estimates of turnover rate were high (median: 0.53), variable among populations (range: 0.15-0.78), but unrelated to displacement distance. Median displacement was Ͻ100 m for 24 populations and was typically Ͻ50 m. The proportion of mobile individuals was low in most populations (median: 19%) and exceeded 50% in only five of the populations. Brook trout, a species central to studies critical of the RMP, appeared to be exceptionally mobile relative to other salmonids. The compatibility of high turnover rates with short displacement distances and the finding that median displacement was usually limited support the notion that restricted movement is the norm in populations of stream salmonids during nonmigratory periods. However, the finding of considerable intra-and interspecific heterogeneity in the extent of movement underscores the potential importance of the mobile component to population processes. By providing an analytical framework that yields quantitative measures of different components of movement and allows for standardized comparisons, these models can bring needed rigor to analysis and design in movement studies.
Rev Med Hondur, Jun 1, 1997
Resumo: Con el propósito de conocer valores normales en Honduras, hemos investigado la concentrac... more Resumo: Con el propósito de conocer valores normales en Honduras, hemos investigado la concentración de ferritina sérica en cuatro grupos de población. De 283 voluntarios estudiados, 13 fueron mujeres no embarazadas, 73 niños, 98 mujeres embarazadas y 99 ...
Publikationsansicht. 44092856. Verdades y mitos de los biocombustibles (2008). Jorge Arturo Herná... more Publikationsansicht. 44092856. Verdades y mitos de los biocombustibles (2008). Jorge Arturo Hernández Zárate,; Marco Antonio Hernández Rodríguez. Details der Publikation. ...
Freshwater Biology, Mar 31, 2005
1. We compared the capacity of logistic regression (LR) and classification tree (CT) models to pr... more 1. We compared the capacity of logistic regression (LR) and classification tree (CT) models to predict microhabitat use and the summer distribution of juvenile Atlantic salmon, Salmo salar, in two reaches of a small stream in eastern Quebec. 2. The models predicted the presence or absence of salmon at a location on the basis of habitat features (depth, current velocity, presence of instream and overhead cover, substratum particle size, and distance to stream bank) measured at that location. Models were validated by means of crossover field tests evaluating the performance of models developed for one reach (calibration trials) when applied to the other reach (validation trials). Model performance was evaluated with regard to accuracy, generality and ease of use and interpretation. Prediction maps based on habitat features were also built to compare the observed position of fish with those predicted by LR and CT models. 3. The spatial distribution of active fish differed markedly from that of resting fish, apparently as a result of the selection for water greater than about 30 cm depth by active fish and for the presence of rocky cover by resting fish. 4. All models made accurate predictions, validated by crossover trials. For both LR and CT models, the prediction maps reflected well the actual fish distributions. However, CT models were easier to build and interpret than LR models. CT models also had less variable performance and a smaller decline in predictive capability in crossover trials (for fish at rest), suggesting that they may be more transferable than LR models.
El presente estudio teórico -práctico se basa en la preparación y mejoramiento del motor Suzuki F... more El presente estudio teórico -práctico se basa en la preparación y mejoramiento del motor Suzuki Forsa I G10, tanto en la modificación de elementos fijos, la sustitución de elementos móviles y el uso de herramientas tecnológicas para generar un estudio y análisis exacto, así poder alcanzar y controlar los máximos esfuerzos al que estarán sometidos los nuevos componentes, una vez terminado el proceso del trucaje del motor, este debe cumplir con las normativas establecidas según la Federación Ecuatoriana De Automovilismo Deportivo para poder participar en las diversas competencias automovilísticas a nivel nacional. ABSTRACT This study theoretical -practical is based on the preparation and engine improvement I G10 Suzuki Forsa, in the modification of fixed, mobile element replacement and the use of technological tools to generate an accurate survey and analysis, and to achieve and control every effort that will be subject to new components, once the process engine faking it must meet the standards set by the Ecuadorian Federation of motor Sports to participate in various racing events nationwide.
Rev Inst Nac Enfermedades Respir, Jun 1, 1995
Http Dx Doi Org 10 1577 1548 8675017 2 3 Co 2, Jan 8, 2011
In the summers of 1993 and 1994, we conducted trials in natural streams to assess the performance... more In the summers of 1993 and 1994, we conducted trials in natural streams to assess the performance of dye marks and full-length coded wire tags (CWTs) when used simultaneously. Brook trout Salvelinus fontinalis and juvenile Atlantic salmon Salmo salar (fork length ^55 mm) were marked with jet injection of Alcian Blue dye (in the base of the pectoral, pelvic, or caudal fins) and CWT (snout implant). All Alcian Blue marks remained clearly visible for at least 4 weeks. After 8 weeks, 3.1% of brook trout and 11.4% of Atlantic salmon had lost at least one mark. Although loss rates did not differ significantly among marking locations, 86% of mark losses were from the caudal fin. Marking in pelvic or pectoral fin locations induced high mortality in smaller fish. Dye retention was low for individuals recaptured 10-14 months after injection, presumably because interannual growth caused dilution of the mark. Loss rates of CWT in summer were 2.5% for brook trout and 8.4% for Atlantic salmon; for either species, loss rates did not differ significantly among size-classes. Marked fish did not differ from unmarked fish in growth or condition in summer.
Observatorio De La Economia Latinoamericana, 2009
El Banco Mundial en su Informe para el Desarrollo Económico para el año 2009, se enfoca en la geo... more El Banco Mundial en su Informe para el Desarrollo Económico para el año 2009, se enfoca en la geografía económica, como un campo fundamental para el análisis de las razones par que algunos países se encuentren en vía de desarrollo, lejos de los países más ricos. En su análisis retoma tres factores como son la aglomeración que genera economías de
El Banco Mundial en su Informe para el Desarrollo Económico para el año 2009, se enfoca en la geo... more El Banco Mundial en su Informe para el Desarrollo Económico para el año 2009, se enfoca en la geografía económica, como un campo fundamental para el análisis de las razones par que algunos países se encuentren en vía de desarrollo, lejos de los países más ricos. En su análisis retoma tres factores como son la aglomeración que genera economías de
Canadian Journal of Fisheries and Aquatic Sciences, Dec 1, 2007
Shallow fluvial lakes are heterogeneous ecosystems in which marked spatio-temporal variation rend... more Shallow fluvial lakes are heterogeneous ecosystems in which marked spatio-temporal variation renders difficult the analysis of key ecological processes, such as growth. In this study, we used generalized additive modelling of the RNA/DNA ratio, an index of short-term growth, to investigate the influence of environmental variables and spatiotemporal variation on growth of yellow perch (Perca flavescens) in Lake St. Pierre, Quebec, Canada. Temperature and water level had seemingly stronger effects on short-term growth than seasonal change or spatial variation between and along the lakeshores. Consistent with previous studies, the maximum RNA/DNA ratio was found at 20.5°C, suggesting that our approach provides a useful tool for estimating thermal optima for growth in the field. The RNA/DNA ratio showed a positive relationship with water level, as predicted by the flood pulse concept, a finding with implications for ecosystem productivity in fluvial lakes. The RNA/DNA ratio was more variable along the north than the south shore, possibly reflecting exposure to more differentiated water masses. The negative influence of both high temperatures and low water levels on growth points to potential impacts of climatic change on fish production in shallow fluvial lakes.
Geotermia Revista Mexicana De Geoenergia, 2007
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Drafts by Marco Rodriguez
Papers by Marco Rodriguez