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The difficulties were in the marketing questions: (may not be exact) "what experiment could you perform on social media to determine consumer intent" or "how could you use the Reddit or Pinterest API for our analysis"
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Marketing Data Analyst

Interviewed at Shopify

3.3★
Jun 7, 2014

The difficulties were in the marketing questions: (may not be exact) "what experiment could you perform on social media to determine consumer intent" or "how could you use the Reddit or Pinterest API for our analysis"

Suppose we have a binary classification problem. 99.8% of individuals in our sample = 0, 0.2% = 1. We downsample: we randomly sample say 1% of the individuals which =0, but keep all which =1. We fit our model to this new smaller sample, and now we have a model which produces probabilities that an individual = 1. How do we adjust our output probabilities to use this model on the population as a whole?
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Data Analyst

Interviewed at Upstart

3.7★
Dec 20, 2019

Suppose we have a binary classification problem. 99.8% of individuals in our sample = 0, 0.2% = 1. We downsample: we randomly sample say 1% of the individuals which =0, but keep all which =1. We fit our model to this new smaller sample, and now we have a model which produces probabilities that an individual = 1. How do we adjust our output probabilities to use this model on the population as a whole?

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