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<p>What are time series models? Why do we need them when we have less complicated regression models?</p>


<p>What can happen if a traditional regression model is used on data that has autocorrelation?</p>

What can happen if a traditional regression model is used on data that has autocorrelation?

Why Do We Need Time Series Models? I

<p>Why can't standard regression models be used effectively for data points where current values are influenced by past values?</p>

Why can't standard regression models be used effectively for data points where current values are influenced by past values?

Why Do We Need Time Series Models? II

Why Do We Need Time Series Models?

<p>Let’s say you have a time series dataset grouped monthly for the past five years.</p>

<p>How would you find out if the difference between this month and the previous month was significant or not?</p>


Significance Time Series

<p>Let’s say we have a table with an <code>id</code> and <code>name</code> fields. The table holds over 100 million rows and we want to sample a random row in the table without throttling the database.</p>

<p>Write a query to randomly sample a row from this table.</p>

<p><strong>Input:</strong></p>

<p><code>big_table</code> table</p>

<table>
<thead>
<tr>
<th>Columns</th>
<th>Type</th>
</tr>
</thead>

<tbody>
<tr>
<td><code>id</code></td>
<td>INTEGER</td>
</tr>

<tr>
<td><code>name</code></td>
<td>VARCHAR</td>
</tr>
</tbody>
</table>


Write a query to randomly sample a row from a big table.

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