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 Mar 11 comment How to estimate Simple Returns and Monthly Returns from daily stock price observations with Missing data in R @Aquarius I have no time to formulate a complete answer but there are two types of problems: a) you have different starting dates and dont want to throw the data away. b) you have missing data within the series. For the second one you can look into the em algorithm ,for the first one I see if I have the time to dig up the paper. Obviously, there are plenty of ways and books about imputing values in statistical datasets. You could also look at crossvalidated on this. Feb 1 comment Is it possible to deal with non-normal distribution in Black-Litterman model? @SimoneBortolato The output of the BL method is a vector of means. If you want to optimize based on that means, you have to either assume something about the investor or about the market. Usually, its quadratic utility (only first two moments are relevant) or normality of the market. You say that your market is not normal and you care about it so you probably have to change these assumptions. You could incorporate higher moments into your function or do a full-scale optimization for example. Feb 1 comment Is it possible to deal with non-normal distribution in Black-Litterman model? @John I suppose so. But I guess this is one of the main points of the BL method. What was your problem with the lognormal version? For multi asset portfolios I dont even have an idea how to get the market cap (e.g. for commodities) even if there are no derivatvies though one could argue there are some sources. Jan 29 answered Is it possible to deal with non-normal distribution in Black-Litterman model? Jan 27 awarded Notable Question Nov 18 answered How to get to this answer on Macauley duration? Jul 25 awarded Yearling Jul 20 comment Why do stocks fall so quickly? Technical explanations Great! You could cite a seminal paper youve read and explain why it backs your answer. This would improve your answer a great deal because the OP (and me, too) could check it himself. Dont get me wrong: Almost anyone will have heard of this effect but hardly noone has taken time to verify it for himself (especially for Chinese stocks I would say). Jul 17 comment Why do stocks fall so quickly? Technical explanations Can you back that up somehow or is this just your assumption/interpretation? Jul 15 comment Performance analysis for a changing portfolio To get a meaningful answer to your question, could you state precisely what you mean by performance analysis? Jul 7 comment Getting ETF data from google finance Hi @Richard ! My 2 cents: Maybe it is more practical to do the following - Get data on the actual tracking error and, most importantly, tracking difference from trackinsight.com (i took a fresh look today it seems you have to register now), which is the most CLEANED data provider on etfs out there. Then you could take the historical index and subtract the tracking difference. You can use the tracking error to model a random factor. If you use historical data (fewer etfs!) you have both a shorter history and a less efficient ETF market than today. Jun 23 comment ISM PMI data - sector trend through ranking and seasonal decomposition But to deal with your question: What framework do you have? In the programming language R for example, you can use the command order() to rank the sectors, for seasonal decomposition you can do all kinds of stuff. As a first step I would use a moving average or the decompose() function of the stat package. As far as scaling is concerned, you will divide by the number of sectors at some point - but you can do it in different ways. The question is: do you want to preserve the information that the sector has a PMI that indicates growth or do you just want to see the ranking. Jun 23 comment ISM PMI data - sector trend through ranking and seasonal decomposition Just a small comment from my side. This chart does not say anything AT ALL - and this is the most friendly way for me to put it. I don't see what people get of posts like "It might be clear, it might not be!" - this is a no-brainer. I would recommend anyone to be very careful with this "macro" charts with left and right scales and different origins (especially comparing leading and lagging numbers and not shifting). Jun 23 answered Covariance between two stocks in a two-factor model Jun 17 accepted How to properly assess the costs of replicating an index via futures contracts? Jun 16 comment How to properly assess the costs of replicating an index via futures contracts? The CME article is great! May 6 reviewed No Action Needed Bond in relation to US T-Bill/Risk-Free rate May 6 reviewed Approve Bond in relation to US T-Bill/Risk-Free rate Apr 30 comment Expectation of maximum draw down in the Brownian motion case @Richard Maybe it appears to be a MC simulation because of the default value for $t$, which is $1000$, but to me the code .maxddStats looks like a numerical quadrature with precomputed values which are hard-coded into the function. I didn't look into it in more detail though. Apr 30 reviewed Approve New ways of communicating risk