<p>If you do not want to lose any day, you can copy the last price of your day without price (in your case june 10th). This a commom practice in financial industry.</p>

CC BY-SA 3.0
2015-06-12T18:12:37.700Z
2015-06-12T18:12:37.700Z
Pithit
<p>I don't think that on yearly returns, a day more or less matters too much. In the unlikely case it actually does, you could interpolate the final day. </p>

<p>A first approximation would be the average over June 12th and June 11.</p>

CC BY-SA 3.0
2015-06-12T01:14:30.837Z
The average... why didn't I think of that... thanks!
Alex McLean
CC BY-SA 3.0
2015-06-12T00:56:34.407Z
2015-06-12T00:56:34.407Z
FooBar
<p>I am trying to find the growth rate of a stock over a given year.</p>

<p>Let's say I wanted to find the growth rate from today, June 11, 2015 to June 11, 2014. This is easy enough when you have perfect information and both sets of data exist.</p>

<p>However let's say June 11,2014 stock data does not exist, but June 10th and June 12th do. Which date do I compare to? Do I extend the "year" by a day and go to June 10th, or do I shorten the year and go to June 12th?</p>

<finance><capital-returns>
Calculating the growth rate of a stock over a year with imperfect information
Alex McLean
# Calculating the growth rate of a stock over a year with imperfect information

(Asked by: username_0 on 2015-06-11)

I am trying to find the growth rate of a stock over a given year.

Let's say I wanted to find the growth rate from today, June 11, 2015 to June 11, 2014. This is easy enough when you have perfect information and both sets of data exist.

However let's say June 11,2014 stock data does not exist, but June 10th and June 12th do. Which date do I compare to? Do I extend the "year" by a day and go to June 10th, or do I shorten the year and go to June 12th?

**Tags:** finance, capital-returns


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## 2 answers

### Answer by username_2 on 2015-06-12. Score: 2 | Accepted answer

I don't think that on yearly returns, a day more or less matters too much. In the unlikely case it actually does, you could interpolate the final day.

A first approximation would be the average over June 12th and June 11.

> **Comments:**
> **username_0**: The average... why didn't I think of that... thanks!  

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### Answer by username_1 on 2015-06-12. Score: 0

If you do not want to lose any day, you can copy the last price of your day without price (in your case june 10th). This a commom practice in financial industry.


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