454 search results for "boxplot"

Why I use Panel/Multilevel Methods

July 24, 2015
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Why I use Panel/Multilevel Methods

I don’t understand why any researcher would choose not to use panel/multilevel methods on panel/hierarchical data. Let’s take the following linear regression as an example: , where is a random effect for the i-th group. A pooled OLS regression model for the above is unbiased and consistent. However, it will be inefficient, unless for all

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Why I use Panel/Multilevel Methods

July 24, 2015
By
Why I use Panel/Multilevel Methods

I don’t understand why any researcher would choose not to use panel/multilevel methods on panel/hierarchical data. Let’s take the following linear regression as an example: , where is a random effect for the i-th group. A pooled OLS regression model for the above is unbiased and consistent. However, it will be inefficient, unless for all

Read more »

cricketr digs the Ashes!

July 20, 2015
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cricketr digs the Ashes!

Introduction In some circles the Ashes is considered the ‘mother of all cricketing battles’. But, being a staunch supporter of all things Indian, cricket or otherwise, I have to say that the Ashes pales in comparison against a India-Pakistan match. After all, what are a few frowns and raised eyebrows at the Ashes in comparison

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cricketr digs the Ashes!

July 20, 2015
By
cricketr digs the Ashes!

Introduction In some circles the Ashes is considered the ‘mother of all cricketing battles’. But, being a staunch supporter of all things Indian, cricket or otherwise, I have to say that the Ashes pales in comparison against a India-Pakistan match. After all, what are a few frowns and raised eyebrows at the Ashes in comparison

Read more »

R 101 – Aggregate By Quarter

July 14, 2015
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R 101 – Aggregate By Quarter

We were asked a question on how to (in R) aggregate quarterly data from what I believe was a daily time series. This is a pretty common task and there are many ways to do this in R, but we’ll focus on one method using the zoo and dplyr packages. Let’t get those imports out of the way: library(dplyr) library(zoo) library(ggplot2) Now, we need...

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How to make a rough check to see if your data is normally distributed

July 11, 2015
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How to make a rough check to see if your data is normally distributed

Now then, in the previous article I wrote about hypothesis testing with data that is normally distributed, in this article I’m going to post some quick test you can do to check if it is fairly safe to assume your data is normal. I would like to highlight the fact that you can never be 100% sure that...

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R Package to access the Open Movie Database (OMDB) API

July 10, 2015
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R Package to access the Open Movie Database (OMDB) API

It’s not on CRAN yet, but there’s a devtools-installable R package for getting data from the OMDB API. It covers all of the public API endpoints: find_by_id: Retrieve OMDB info by IMDB ID search find_by_title: Retrieve OMDB info by title search get_actors: Get actors from an omdb object as a vector get_countries: Get countries from

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Using PL/R and PL/Python to find Medians and Quartiles in Postgres

July 10, 2015
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Using PL/R and PL/Python to find Medians and Quartiles in Postgres

I’ve recently been exploring options to calculate median and quartiles in my Postgres database. If you’re familiar with quartiles you know how handy they can be. There’s a few different options in the Postgres universe to accomplish this, so I figured I would give them all a whirl and see which was the friendliest (and

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Taking cricketr for a spin – Part 1

July 6, 2015
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Taking cricketr for a spin – Part 1

“Curiouser and curiouser!” cried Alice “The time has come,” the walrus said, “to talk of many things: Of shoes and ships – and sealing wax – of cabbages and kings” “Begin at the beginning,”the King said, very gravely,“and go on till you come to the end: then stop.” “And what is the use of a

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Taking cricketr for a spin – Part 1

July 6, 2015
By
Taking cricketr for a spin – Part 1

“Curiouser and curiouser!” cried Alice “The time has come,” the walrus said, “to talk of many things: Of shoes and ships – and sealing wax – of cabbages and kings” “Begin at the beginning,”the King said, very gravely,“and go on till you come to the end: then stop.” “And what is the use of a

Read more »

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