search for: price1

Hi, I have two products which are substitudes. I try to fix a system as below to mydata. Demand1 = A1 -B1*Price1 + C1*Price2 Demand2 = A2 +B2*Price1 - C2*Price2 I would expect C1 & B2 to be symmetric, If they are truly substitude. How can I enforce this symmetry when creating a system of equations via SystemFit ? -- View this message in context: http://www.nabble.com/SystemFit-tp24588252p24588252.html...

Hi, I am trying to run many different regressions using a FOR Loop. The input data that is read into R has the following variables · Volume · Price1 · Price2 · Price3 · Price4 · Price5 · Trend · Seasonality I want to run 5 regressions, with the Volume as an dependent variable and Price, Trend & Seasonality as independent variables. I have read the above mentioned variables in a variab...

...n each of them will differ. How do I create a new file which contains data from both these files? Cbind and merge are not helpful. For cbind because the rows are not the same replication occurs. Also if I have similar data how do I write a vlookup kind of function? I am giving an example below: Say Price1 file contains the following: Date Price 2/3/2010 134.00 3/3/2010 133.90 4/3/2010 135.55 And say price2 contains the following: Date Price 2/3/2010 2300 3/3/2010 3200 4/3/2010 1800 5/3/2010 1900 I want to take both these data t...

I would like to create a subtotal table with custom bands. seq1 = seq(0, 100, by = 5) seq2 = seq(100, 1000, by = 100) Bands = c(seq1, seq2) #Prices Prices = sample(1:1000, 200, replace=F) #corresponding size for the given price above. size = sample(1:1000, 200, replace=F) How would I find the subtotal of the size based on a given price falls within a band? -- View this message in

Hi everyone: I did a search over the internet and still couldn't find answer to my problem. I have a series of prices that I'm trying to clean up by removing any prices greater than 3 times the standard deviations. So, say that prices are: price1 2010-06-18 08:00:06.916 2730 2010-06-18 08:00:07.005 2730 2010-06-18 08:00:07.005 2729 2010-06-18 08:00:07.451 2730 2010-06-18 08:00:07.451 2730 2010-06-18 08:00:07.805 2730 2010-06-18 08:00:08.010 2730 2010-06-18 08:00:08.354 2730 2010-06-18 08:00:08.354 2729 2010-06-18 08:00:08....