similar to: ActiveRecord trace sql

Hi everyone! Thank you for the help you have been given to me, and here I'm with another problem with my dataframes: I have two dataframes (with much more observations), like these: Dataframe1 Firm Year cash 500400200 2007 100 500400200 2006 200 500400200 2005 400 500400300 2007 300 500400300 2006 240 500400300 2005 120 500400400

I have a dataframe with many firm-year observations and many variables. Not all firms have information for all the years. I want another dataframe with only those firms that have information all years. This is, I want a balanced panel data, but with the maximum number of years. In my reprocucible example I want to keep firms 1,2 and 3 (period 2000 to 2004). I need your help to create a

Hi all, Quick question for STI. With the following setup: class Company < AR::Base; end class Firm < Company; end Why does Firm.find(:all) return all Companies, not just those that have type==''Firm''? -- Alex

In an effort to not be a vamp. (Thanks Amy) Here is the error message = I''m getting. Mysql::Error: #42000You have an error in your SQL syntax; check the = manual that corresponds to your MySQL server version for the right = syntax to use near ''=A1=C9=A8[=A9=B4#Globals = (ActiveRecord::StatementInvalid) SET @rightnow =3D current_timestamp; It appears that Active Record is

Hello folks, I''m trying to do something like: 1. db = ActiveRecord::Base.establish_connection(:adapter => "mysql", :database => "app_development", :username => "root") 2. Cmd = File.read(''commands.sql'') <--- Command.sql contains multiple valid SQL statement. I''ve tested this directly by piping it into MySQL from the

Hi there, I have a huge data set with multiple firms years and other firm characteristics. I want to run a regression on the dependent variable and other explanatory variables and calculate the residual terms by grouping the firms in same year and same industry. What I want to do is to divide my obseravtion into sub sample that contains the observation with same fiscal year(FYEAR=1990) and same

Hi R-helpers, My real data is a panel (unbalanced and with gaps in years) of thousands of firms, by year and industry, and with financial information (variables X, Y, Z, for example), the number of firms by year and industry is not always equal, the number of years by industry is not always equal. #reproducible example firm1<-sort(rep(1:10,5),decreasing=F) year1<-rep(2000:2004,10)

1 down vote favorite my problem is the following: I am using the R SNA package for social network analysis. Lets say, my starting point is an edgelist with the following characteristics. Every row contains a firm name, the ID of a project they are involved and further characteristics, let's say the projects year. Firms can be in several projects, and one project can consist of a

Hi, I have recently use the strucchange package in R with a single time series observation. I found it extremely useful in the testing of change points. Now, I am thinking of using the strucchange package with panel data (about 500 firms, with 73 monthly time series observations each). For each firm, I have to conduct the Fstats and breakpoints tests. Based on the test of each firm, I have to

I need help in subseting a dataframe: data1<-data.frame(year=c(2001,2002,2003,2004,2001,2002,2003,2004, 2001,2002,2003,2004,2001,2002,2003,2004), firm=c(1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4),x=c(11,22,-32,25,-26,47,85,98, 101,14,87,56,12,43,67,54), y=c(110,220,302,250,260,470,850,980,1010,140,870,560,120,430,670,540)) data1 I want to keep the firms where all x>0 (where there are

i got my app running with ms sql server as the database and everything worked fine. migrations, indexes, constraints, find, create, update, etc.. the app isn''t actually a web app, butwill be running isolated on severally diff machines that may not have consistent internet access.. part of the requirements was to setup replication so that eventually the separate instances would

Hi all, I have 2 tables and a standard one-to-many association. How do I substitute the following sql with ActiveRecord calls so that it uses just one sql statement: update geo_entities set terminal_id = 3 where id = 10 or id = 23 or id = 87; Thank you! Regards, Yuri Leikind --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to

Hi The PostgreSQL development group released an update[1] for PostgreSQL to address a SQL injection vulnerability. From the infromation[2] released with this update, it appears the vulnerability exists in other (all?) database systems allowing multi-byte encoding of requests. Of particular importance - since it relates not to database issues but to web programming practices - are these quotes

Hi together I'm pretty new to R, so excuse me if it is a basic question. I have a big dataset (extract of it found in the attachment) of returns from firms. I'd like to compute the Pearson correlation of each firm with the "Market" and the corresponding p-Value. So I thought of making a list of 'cor.test's and then extract the needed values with a for loop. What I did so

Hi, all! Anyone know an easy way to specify the following model. Panel dataset, with stock through time, by firm. I want to run a model of y on a bunch of explanatory variables, and one dummy for each firm, which is 1 for observations that come from firm i, and 0 everywhere else. I have over 200 firms (and a factor variable that contains a firm identifier). Any easy way of going about

I keep some sensitive information encoded using MySQL''s ENCODE and DECODE commands in the database table. -- example SQL: SELECT *, DECODE(ccnumblob, ''salthere'') AS ccnum FROM customers WHERE id=2; UPDATE customers SET ccnumblob = ENCODE(''4321432143214321'', ''salthere'') WHERE id=2; INSERT INTO customers (name, ccnumblob) VALUES

Folks, I have a situation with many firms, observed for many years (but it's not panel data, so every now and then data for a firm just goes missing). Let me show you an example. There are 3 firms "a", "b" and "c". There are 3 years: 1981, 1982 and 1983. There's a factor f which takes values 1, 2 or 3. set.seed(5) D = data.frame( names=c("a",

I want to use an array in the :conditions of an ActiveRecord Find so that a SQL IN statement is created. However, I also want to specify a greater than condition on a timestamp column too. From the Docs: An array may be used in the hash to use the SQL IN operator: Student.find(:all, :conditions => { :grade => [9,11,12] }) How do I modify this so that it also contains the timestamp

I want to write an independent (not model-related) SQL query for some statistic information in an online shop system. So I know I could grab all users with ActiveRecord and then just count the array size, but that would massively waste resources. And I also want MySQL to do some max, min and average calculations. So is there a way to issue a query and get the result set without models being

All, ActiveRecord 1.14.3, sqlserver adapter, odbc mode I have a table in SQL Server with a smalldatetime column - let''s call it little_date. little_date is not allowed to have NULLs per the database schema. I am creating a new ActiveRecord object using obj.new (no database save) and calling obj.little_date. So I''m doing: obj.new obj.little_date What I observe is that if