Can I convert daily time-series to monthly observations using the Excel Add-In?

When downloading data that is in time-series format, it is possible to change the frequency (e.g. daily to monthly) by using the QSERIES formula or the Quandl Formula Builder

However, when downloading data that is in tables format, it is not possible to change the frequency (e.g. daily to monthly). For tables, we recommend downloading the raw data and carrying out the required frequency transformation using your own analytics tool.

Note that data on Nasdaq Data Link comes in two formats:  time-series and tables. You can learn more about these formats here.

Using the QSERIES formulaNote that the structure of the QSERIES formula is as follows, with frequency as the third argument:

=QSERIES(quandlCode, dateRange, frequency, sortOrder, transformation, limit, headers, dates, transpose)

To return monthly data, put "monthly" in the frequency argument, like this: 


The above formula will return monthly data for the XNAS/ACIW time-series. 

The frequency argument can be "daily","weekly", "monthly", "quarterly" or "annual". 

Note that the conversion process is very simple: 
Nasdaq Data Link simply takes the last observation in the day/month/week/quarter/year and uses that as the daily/monthly/weekly/quarterly/annual datum. 

This simple conversion process does not work well for time-series that contain percentage changes, period averages/totals (e.g. trading volume) or period extremes (e.g. high/low or OHLC for security prices). For such time-series, we recommend downloading the raw data and carrying out the required daily to monthly transformation using your own analytics tool.

Note also that you can only convert a time-series to a less granular frequency (e.g. daily to monthly) and never the other way around to a more granular frequency (e.g. annual to daily). 

Using the Quandl Formula Builder
To return monthly data by using the Quandl Formula Builder, please follow these steps:

  • Open Excel
  • Go to the Quandl tab and click Get Data

  • Search for the time-series data feed you want or enter the database code for the data feed you want. For example, enter XNAS for the NASDAQ Stock Market Prices, like this: 

  • Click Next and follow the prompts. When you reach the Filters stage and can filter by Frequency, select Monthly from the drop down, like this:

  • Enter any other desired filters and click Next. Follow the prompts to download the data.
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