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Main Author:	Antoni Riera Font
Format:	Artículo científico
Language:	es
Published:	Asociación Española de Ciencia Regional 2006
Subjects:	Estudios Territoriales NBER GAMS Indicadores sintéticos modelos de optimización análisis de coyuntura regional
Online Access:	https://www.redalyc.org/articulo.oa?id=28900905
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Modelos de optimización y su aplicabilidad en el análisis de coyuntura regional Antoni Riera Font Josep Mateu Sbert Estudios Territoriales NBER GAMS Indicadores sintéticos modelos de optimización análisis de coyuntura regional El uso de modelos factoriales dinámicos, al objeto de capturar la evoluciónde la actividad económica se ha extendido ampliamente en la mayoría de paísesdesarrollados. Sin embargo, aunque dichos modelos se pueden adaptar a contextos deescasa información, los resultados obtenidos suelen ser, por lo general, imprecisos ypoco robustos. El objetivo de este trabajo es demostrar empíricamente que en contextosde escasa información, la utilización de modelos de optimización con variablesbinarias permite obtener una mejor aproximación al ciclo económico en la medidaque es posible capturar no sólo la relación individual que mantiene cada uno de losindicadores parciales con la serie de referencia (medida por el nivel de correlación)sino también la relación conjunta que existe entre un determinado subconjunto de losmismos y la serie de referencia 2006 artículo científico 1695-7253 https://www.redalyc.org/articulo.oa?id=28900905 es http://www.redalyc.org/revista.oa?id=289 Investigaciones Regionales - Journal of Regional Research application/pdf Asociación Española de Ciencia Regional Investigaciones Regionales - Journal of Regional Research (España) Num.9

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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