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Use of ~ (tilde) in R programming Language

...e right of <- is a formula object. It is often used to denote a statistical model, where the thing on the left of the ~ is the response and the things on the right of the ~ are the explanatory variables. So in English you'd say something like "Species depends on Sepal Length, Sepal Width, Petal L...
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What is a provisioning profile used for when developing iPhone applications?

...a provisioning profile and why is it needed when developing an iPhone application? If I don't have a provisioning profile, what happens? ...
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SQL Add foreign key to existing column

... Error indicates that there is no UserID column in your Employees table. Try adding the column first and then re-run the statement. ALTER TABLE Employees ADD CONSTRAINT FK_ActiveDirectories_UserID FOREIGN KEY (UserID) REFERENCES Ac...
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Best way to work with transactions in MS SQL Server Management Studio

Let's say I have an SQL statement that's syntactically and semantically correct so it executes. 2 Answers ...
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Comparing Timer with DispatcherTimer

...Forms.Timer() and System.Windows.Threading.DispatcherTimer() ? In which cases, we should use them? any best practices ? ...
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in entity framework code first, how to use KeyAttribute on multiple columns

... I'm using the decoration to make a property map to a PK column. But how can I define a PK on more then one column, and specifically, how can I control order of the columns in the index? Is it a result of the order of properties in the class? ...
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What is the difference between `after_create` and `after_save` and when to use which?

...that, according to the docs, ActiveRecord's update_all does not invoke any callbacks, including after_* – user2426679 Jan 10 at 19:34 add a comment  |  ...
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Python Mocking a function from an imported module

...ge you are not patching the namespace the module is imported from (in this case app.my_module.get_user_name) you are patching it in the namespace under test app.mocking.get_user_name. To do the above with Mock try something like the below: from mock import patch from app.mocking import test_metho...
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Difference between $state.transitionTo() and $state.go() in Angular ui-router

...metimes we use $state.transitionTo() and sometimes we use $state.go() . Can anyone tell me how they differ and when one should be used over the other? ...
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How do I list all loaded assemblies?

... information). Using Process Explorer If you want an external tool you can use the Process Explorer (freeware, published by Microsoft) Click on a process and it will show a list with all the assemblies used. The tool is pretty good as it shows other information such as file handles etc. Progr...