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BBCNEWS BBC News June 4, 2024 19:27:00

Up from 990,000 the previous week. cases have risen in all four nations of the uk. our medical editor, fergus walsh, has more about these latest figures. the office for national statistics survey the most reliable indicator of codeless suggest the following figures. increases being driven by two even more contagious sub levels of common cold balpha macro for and later mac a5. of common cold balpha-macro for and later mac its- later mac a5. even in those who had a revious later mac a5. even in those who had a previous infection later mac a5. even in those who had a previous infection of later mac a5. even in those who had a previous infection of a later mac a5. even in those who had a previous infection of a week- later mac a5. even in those who had a previous infection of a week when | a previous infection of a week when it is possible you can get reinfected and in particular we have this variance circulating now which are quite this variance circulating now which are quite di ....

Fergus Walsh , Office For National Statistics , Common Cold , Sub Levels ,

BBCNEWS BBC News February 9, 2022 15:07:00

Question of whether there is enough community around to prevent onward transmission is really the question. at the moment, as long as a lot of people are testing for antibodies in the blood, but that does not necessarily mean they cannot get a local infection in their nose or long and therefore become sick and transmit it. it does mean that people are very, very unlikely to get very sedate severe disease, particularly with the relatively miles on a covariance and the said variants as well. relatively mild covid 19 variants. 0micron variant. we do want to remain cautious and we do not people going back to work if they are sick. whether it is influenza or covid 19, people should not be going round infecting people at work, people need to behave responsibly and to do all they can to not infect other people. all they can to not infect other ....

Onward Transmission , 0micron Variant ,

Covariance estimation for risk-based portfolio optimization: an integrated approach

This paper presents a stochastic optimization framework for integrating time-varying factor covariance models in a risk-based portfolio optimization setting. ....

Generalised Autoregressive Conditional Heteroscedasticity Garch , Regression Analysis , Neural Networks ,

Bayesian nonparametric covariance estimation with noisy and nonsynchronous asset prices

This paper introduces a Bayesian nonparametric method to estimate the ex post covariance matrix from high-frequency data. ....

Monte Carlo , Covariance Matrix , Bayesian Modelling , Original Research ,

Uncertain risk parity - Journal of Investment Strategies

Uncertain risk parity
Point-estimated covariance can hide risks and leaves risk parity vulnerable to estimation error.
Modeling covariance as uncertain instead of fixed captures ambiguity about the present and accounts for changing regimes.
Allocating risk under uncertain covariance creates weightings that perform robustly under estimation error and across market conditions.
Abstract
Risk parity is a portfolio construction technique that scales sections of a portfolio (eg, stocks, bonds, currencies, commodities) so that forecasted contributions to net portfolio risk match the budget. Because risks are measured from a point estimate of covariance, the method is subject to problems of estimation error. This paper treats covariance as uncertain in order to find a risk parity weighting that does not count on perfectly optimized hedges and is robust to changes in regime. Separately, of general interest are the uncertain risk contributions calculated en route. Report ....

Factor Models , Portfolio Construction , Risk Parity , Investment Strategies , Original Research ,