Also a solid knowledge of a wide range of R functions is useful.
This chapter introduces you to a bunch of useful functions for data structure manipulation, regular expressions and working with times and dates. As a data scientst in training, you've estimated a regression model on the sales data for the past six months.
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After evaluating your model, you see that the training error of your model is quite regular, showing both positive and negative values. You can work in parts, or with a single one-liner. There's no need to store the result in a variable, just have R print it.
Head over to the next exercise. Can you trace it and fix it?
Remember: you want to call mean only once! Therefore, merging the two vectors is a must! Works on numerics, but also on character strings and logicals. Remember the social media profile views data?
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Your LinkedIn and Facebook view counts for the last seven days are already defined as lists on the right. Print the resulting vector.
These instructions required you to solve this challenge in a step-by-step approach. If you're comfortable with the functions, you can combine some of these steps into powerful one-liners. It's up to you to see what unforgivable mistakes we've made. Debugging code is also a big part of the daily routine of a data scientist, and you seem to be great at it!
As a pupil, he had a lazy dating pdf into word kiiara who wanted to keep the classroom busy by having them add up the numbers 1 to Gauss came up with an answer almost instantaneously, On the spot, he had developed a formula for calculating the sum of an arithmetic series.
There are more general formulas for calculating the sum of an arithmetic series with different starting values and increments. Instead of deriving such a formula, why not use R to calculate the sum of a sequence? Print the result to the console.
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Head over to the next video and learn more about regular expressions! In this and the following exercises, you'll be querying and manipulating a character vector of email addresses!
Print the result to the output.