<p>You don’t. CPI is a proxy for the fantastical concept of a real price. Any measure will have theoretical implications (Australia’s CPI makes some very funny housing assumptions, for example).</p>

<p>As the measure is a proxy for a theorised but unreachable category, and as the measure is only available at its noted frequencies you can’t create a line. Part of the measure is its frequency. </p>

<p>This is impossible for two reasons:</p>

<ul>
<li>proxies are just that</li>
<li>a measure which is grounded in theoretical assumptions and produced with a frequency can’t be resolved smaller than that frequency</li>
</ul>

<p>You might look into producing a new measure acting as a proxy with a desired frequency, but only state agents and historians tend to go about these windmill fights. </p>

CC BY-SA 4.0
2019-03-03T05:29:25.127Z
2019-03-03T05:29:25.127Z
Samuel Russell
<p>It seems the highest-frequency consumer price index (CPI) data available is monthly. How does one convert weekly or daily price data into real prices?</p>

<econometrics>
How does one deflate weekly price data?
user21273
# How does one deflate weekly price data?

(Asked by: username_0 on 2019-03-03)

It seems the highest-frequency consumer price index (CPI) data available is monthly. How does one convert weekly or daily price data into real prices?

**Tags:** econometrics

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## 1 answers

### Answer by username_1 on 2019-03-03. Score: 1

You don’t. CPI is a proxy for the fantastical concept of a real price. Any measure will have theoretical implications (Australia’s CPI makes some very funny housing assumptions, for example).

As the measure is a proxy for a theorised but unreachable category, and as the measure is only available at its noted frequencies you can’t create a line. Part of the measure is its frequency.

This is impossible for two reasons:

* proxies are just that
* a measure which is grounded in theoretical assumptions and produced with a frequency can’t be resolved smaller than that frequency

You might look into producing a new measure acting as a proxy with a desired frequency, but only state agents and historians tend to go about these windmill fights.


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