Search results for "Very high frequency"
showing 3 items of 3 documents
De las copulativas identificativas a las justificativas con 'es que'
2021
Las construcciones encabezadas por es que se utilizan, entre otras cosas, para justificar lo dicho, el acto de habla realizado, la réplica que se introduce, etc. Estas construcciones justificativas se formaron a partir de copulativas identificativas del tipo lo que ocurre / el problema es que... en contextos en los que no se explicita el sujeto y emerge una inferencia de causalidad. La construcción empieza a documentarse en el siglo xvi e inicialmente se usa para introducir una explicación o una justificación de lo dicho. A este significado se añade muy pronto un valor contrastivo, sobre todo en contextos de réplica, y más tarde, coincidiendo con la gran difusión de la construcción en la le…
Persistent cow's milk protein intolerance in infants: the changing faces of the same disease
1998
Background Recent research has shown that cow's milk protein intolerance (CMPI) often persists beyond 4 years of age. Aims To evaluate the clinical and immunological characteristics of a group of infants with persistent CMPI. Patients and methods Twelve infants (6 m, 6f) with persistent CMPI were followed up from birth until a median age of 5 years. The patients underwent CMP challenge each year to evaluate CMP-tolerance. As controls we followed 26 infants (12 m, 14 f) with CMPI that resolved within 1–2 years. Results A family history of atopic disease was found in 10/12 patients with persistent CMPI and in 10/26 controls (P < 0.01). Clinical presentation changed over time: at onset symptom…
Emergence of time-horizon invariant correlation structure in financial returns by subtraction of the market mode
2007
We investigate the emergence of a structure in the correlation matrix of assets' returns as the time-horizon over which returns are computed increases from the minutes to the daily scale. We analyze data from different stock markets (New York, Paris, London, Milano) and with different methods. Result crucially depends on whether the data is restricted to the ``internal'' dynamics of the market, where the ``center of mass'' motion (the market mode) is removed or not. If the market mode is not removed, we find that the structure emerges, as the time-horizon increases, from splitting a single large cluster. In NYSE we find that when the market mode is removed, the structure of correlation at t…