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Adding a regression line on a ggplot

I'm trying hard to add a regression line on a ggplot. I first tried with abline but I didn't manage to make it work. Then I tried this... ...
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Order data frame rows according to vector with specific order

Is there an easier way to ensure that a data frame's rows are ordered according to a "target" vector as the one I implemented in the short example below? ...
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How to find out what group a given user has?

In Unix/Linux, how do you find out what group a given user is in via command line? 5 Answers ...
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Android - Set fragment id

How can I set a Fragment 's Id so that I can use getSupportFragmentManager().findFragmentById(R.id.--) ? 7 Answers ...
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Available text color classes in Bootstrap

I'm developing a sign up page, by putting some text as the title at the navigation bar. I want to give those texts different colors. For this purpose I'm using a separate CSS file, but I want to do this using bootstrap's CSS file. ...
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Using WebAPI or MVC to return JSON in ASP.NET

I'm building an ASP.NET MVC application that is client-script heavy, it will use JSON and jQuery to manipulate the DOM. 6 A...
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In .NET, which loop runs faster, 'for' or 'foreach'?

In C#/VB.NET/.NET, which loop runs faster, for or foreach ? 40 Answers 40 ...
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How to change letter spacing in a Textview?

How can i change letter spacing in a textview? Will it help if I have HTML text in it (I cannot use webview in my code). 8 ...
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Altering a column: null to not null

I have a table that has several nullable integer columns. This is undesirable for several reasons, so I am looking to update all nulls to 0 and then set these columns to NOT NULL . Aside from changing nulls to 0 , data must be preserved. ...
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Meaning of Android Studio error: Not annotated parameter overrides @NonNull parameter

I'm trying out Android Studio. Upon creating a new project and adding a default onSaveInstanceState method to the create MyActivity class, when I try to commit the code to Git, I get a strange error I don't understand. The code is this: ...