# Monthly Archives: October 2012

## Product revenue prediction with R – part 3

October 8, 2012
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After development and improvement  of predictive model with R (as in the previous blog), I have focused here about making a prediction with the R model ( linear regression model ) and comparison with the Google prediction API model. In statistical modeling, R will calculate intercept and variable coefficients to describe the relationship between a

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## Product revenue prediction with R – part 1

October 8, 2012
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In my upcoming three blogs, I am going to discuss about how Product managers, Data analyst and Data scientists can develop model for the prediction of the transactional product revenue on the basis of user actions like total numbers of time product added to the cart, total numbers of time product added to the cart,

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## Two ways that correlation and stepwise regression can give different results

October 8, 2012
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In general, a correlation test is used to test the association between two variables (y and z). However, if there is a third variable (x) that might be related to z or y, it makes...

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## Summarizing Data

October 8, 2012
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In this post, I'll go over four functions that you can use to nicely summarize your data.  Before any regression analysis, a descriptive analysis is key to understanding your variables and the relationships between them.  Next week, I'll have...

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## Example 10.5: Convert a character-valued categorical variable to numeric

October 8, 2012
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In some settings it may be necessary to recode a categorical variable with character values into a variable with numeric values. For example, the matching macro we discussed in example 7.35 will only match on numeric variables. One way to conve...

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## DIY ZeroAccess GeoIP Analysis : So What?

October 8, 2012
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NOTE: A great deal of this post comes from @jayjacobs as he took a conversation we were having about thoughts on ways to look at the data and just ran like the Flash with it. Did you know that – if you’re a US citizen – you have approximately a 1 in 5 chance of getting the

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## CrowdANALYTIX – Ideation Contest – Warranty Pricing

October 8, 2012
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I recently completed an ideation contest on CrowdANALYTIX where the participants had to build an approach towards warranty pricing and fraud detection.Ideation contests are quite different from the usual data mining contests where the objective is...

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## Functions for plotting and getting Greek in labels

October 8, 2012
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The problem: We often want to plot data and assign plot attributes based on characteristics of the data. For example, if we have a group of students with the following IQs, we might want to indicate who is an outlier in the statistical sense. I like...

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## S&P 500 correlations up to date

October 8, 2012
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I haven’t heard much about correlation lately.  I was curious about what it’s been doing. Data The dataset is daily log returns on 464 large cap US stocks from the start of 2006 to 2012 October 5. The sector data were taken from Wikipedia. The correlation calculated here is the mean correlation of stocks among … Continue reading...

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## GBIF biodiversity data from R – more functions

October 8, 2012
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We have been working on an R package to get GBIF data from R, with the stable version available through CRAN here, and the development version available on GitHub here. We had a Google Summer of code stuent work on the package this summer - you can se...

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