similar to: Elasticity

Hello to everyone! I have a question for you..I need to predict multivariate time series, for example sales of 2 products related one to the other, having the 2 prices like inputs.. Is there in R a function to do it? I saw dse package but I didn't find what a I'm looking for.. Could anyone help me? Thank you very much Giusy -- View this message in context:

Dear R-users, I would like to calculate elasticities and sensitivities of each parameters involved in the following transition matrix: A <- matrix(c( sigma*s0*f1, sigma*s0*f2, s, v ), nrow=2, byrow=TRUE,dimnames=list(stage,stage)) The command "eigen.analysis" avaliable in package "popbio" provides sensibility matrix and elasticity matrix

Hi, I couldn''t find a better word for pop, but let''s go: There are 3 models: sale, pop and product sale: -total:integer pop: -quantity:integer -discount:float product: -name:string -price:float A sale can have many different products, each one has a quantity and discount associated. So each sale has_many :products through => pops And each product has_many :sales

Dear all, I have uploaded a new package called micEcon (version 0.1-3) to CRAN (an early version of this package has been already presented at useR! 2004). It contains tools for microeconomic analysis and microeconomic modeling. These are for instance: - tools for demand analysis with the 'Almost Ideal Demand System' (AIDS): e.g. econometric estimation, calculation of price and

Dear all, I have uploaded a new package called micEcon (version 0.1-3) to CRAN (an early version of this package has been already presented at useR! 2004). It contains tools for microeconomic analysis and microeconomic modeling. These are for instance: - tools for demand analysis with the 'Almost Ideal Demand System' (AIDS): e.g. econometric estimation, calculation of price and

I have a set of data that is basically sales figures for a given year. It has columns for Yeaqr, Day Of Year, Sku, SubCatetory, and Category. The first few lines of data look like: Year DayOfYear Sku Quantity CatId Category SubCategory 1 2007 1 100091 1 10862 HOLIDAY Christmas 2 2007 1 100138 1 11160 PET COSTUMES Famous

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Dear all, I'm in basic setup of my network: I try to do a call from a softphone to an other one but I got the error 603 Declined. Below the sip.conf: *[gianca] type=friend username=gianca secret=pwd_gianca host=dynamic context=tutorial* *[giusy] type=friend username=giusy secret=pwd_giusy host=dynamic context=tutorial* extension.conf: *[tutorial] exten => 1234,1,Dial(SIP,gianca)* *exten

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Hello, my name is Giusy and it's the first time I post in this forum. I'm a beginner with R, I have to use it to analyse time series and I need some help about these problems: 1. In my time series there are some NA values, but functions (arimaId, arima,..) seem not to work in this case...what could I do? 2. I have to manage with time series with more than one seasonality, for example

When I add an item to the shopping cart, I get an error: undefined local variable or method `cart_item'' for #<#<Class:0x3715a78>:0x3715a48> Session info says the cart being updated properly. I''m just not able to output two variables: <%= cart_item.quantity %> &times; <%= h(cart_item.title) %> I did some research, and I can grasp that local

I own a lot to the folks on r-help list, especially arun who answered every of my question and was never wrong. I am disinclined to once again ask this question, since it is more arithmatic than technical. But, having worked 2 days on it, I realized my brain is just not juicy enough.... Here is the problem. Trust not for freedom to the Franks--- They have a king who buys and sells. -

This is my code i don't understand the error message: library(rgenoud) rm(list=ls()) set.seed(666) ######################################################### # As a first step, it is assumed that all input parameters are independent of ageing : ######################################################### InputDim <-20 # Max number of ageings in the inputs CPIRate <- rep(0.02 , InputDim ) #

Dear all, I'm setting up a connection via XLITE softphone and asterisk 1.4 but I get the error: *Registration error: 404 Not found* Here my configuration file of asterisk: *[root at dhcppc0 asterisk]# vi sip.conf [gianca] type=friend username=gianca secret=pwd_gianca host=dynamic context=tutorial* *[giusy] type=friend username=giusy secret=pwd_giusy host=dynamic context=tutorial* *[root at

Hi, I'm dealing with an optimization problem. I'm using 'optim' to maximize the output of a function, given some restrictions on the input. I would like to know if there is a way to impose some restrictions on 'intermediate variables' of the function. An example.. fx = function (x) { s <- 0 for (i in 1:3) { s <- x[i]^3 + s } s } optim(rep(4,3),

hi guys im playing with RoR with the environment of rails 3 ruby 1.9 i got stuck in nil can''t be coerced into BigDecimal error i need to get the total cost of the products inside the cart i know where the problem is(i think) but i almost did every thing cart/show.html.rb <div class="cart_title" >Your Cart</div> <table> <% for item in

Any ideas on why this is? The quantity field in mysql is INT, but I get back a string? This is preventing me from using the increment method. >> @cart = Cart.new => #<Cart:0x2730f40 @new_record=true, @attributes={}> >> @cart.items << Item.find(:first) => [#<Item:0x272d6ec @attributes={"vendor_id"=>"1",

Hi, I have one problem with validation I am creating e-shop and I have products. This view look like this: <% for product in @category.products %> <div class="produktyBox"> <%= product.title %><br /> Price: <br /> <div style="color:red; font-size:large; font-weight:bold; margin- bottom:5px"><%=

In December, the packages "miscTools" and "micEconAids" were separated from the "micEcon" package. Now, two further packages have been separated from the micEcon package: "micEconSNQP" and "micEconCES". The "micEconSNQP" package (version 0.6-2) provides tools for production analysis with the Symmetric Normalized Quadratic (SNQ) profit

In December, the packages "miscTools" and "micEconAids" were separated from the "micEcon" package. Now, two further packages have been separated from the micEcon package: "micEconSNQP" and "micEconCES". The "micEconSNQP" package (version 0.6-2) provides tools for production analysis with the Symmetric Normalized Quadratic (SNQ) profit