Every year, on 4th Thursday of November, folks in US celebrate Thanksgiving day.
Thanksgiving Day is a harvest festival. Traditionally, it is a time to give thanks for the harvest and express gratitude in general. [Source: Wikipedia]
A similar holiday exists in Canada too, they celebrate it on Second Monday of Every October.
We will celebrate thanksgiving in PHD style, by sharing a wacky formula tip.
Today, we are going to learn how to use excel formulas to find out thanksgiving day’s date for any year. Now, if only turkeys could use excel, they would be running for cover.
The formula:
Assuming cell A1 has the year, the formula to find US thanksgiving day’s date is,
To find Canadian thanksgiving date,
How does this formula work?
It is fetching the fourth Thursday of November by finding out what day of week November first is and then adding sufficient number of days to it. For eg. November First, 2009 is a Sunday, so thanksgiving day will be on 26th.
Happy thanksgiving everybody
I am in Denmark now, and there is no concept of Thanksgiving day here. But we don’t need a holiday to be thankful for all the wonderful things we have in life. I am thankful to have a loving wife and 2 wonderful kids and 6919 PHD members. Thank you.
PS: Watch out for a thanksgiving sale announcement on PHD in the next 3 hours.
8 Responses to “Pivot Tables from large data-sets – 5 examples”
Do you have links to any sites that can provide free, large, test data sets. Both large in diversity and large in total number of rows.
Good question Ron. I suggest checking out kaggle.com, data.world or create your own with randbetween(). You can also get a complex business data-set from Microsoft Power BI website. It is contoso retail data.
Hi Chandoo,
I work with large data sets all the time (80-200MB files with 100Ks of rows and 20-40 columns) and I've taken a few steps to reduce the size (20-60MB) so they can better shared and work more quickly. These steps include: creating custom calculations in the pivot instead of having additional data columns, deleting the data tab and saving as an xlsb. I've even tried indexmatch instead of vlookup--although I'm not sure that saved much. Are there any other tricks to further reduce the file size? thanks, Steve
Hi Steve,
Good tips on how to reduce the file size and / or process time. Another thing I would definitely try is to use Data Model to load the data rather than keep it in the file. You would be,
1. connect to source data file thru Power Query
2. filter away any columns / rows that are not needed
3. load the data to model
4. make pivots from it
This would reduce the file size while providing all the answers you need.
Give it a try. See this video for some help - https://www.youtube.com/watch?v=5u7bpysO3FQ
Normally when Excel processes data it utilizes all four cores on a processor. Is it true that Excel reduces to only using two cores When calculating tables? Same issue if there were two cores present, it would reduce to one in a table?
I ask because, I have personally noticed when i use tables the data is much slower than if I would have filtered it. I like tables for obvious reasons when working with datasets. Is this true.
John:
I don't know if it is true that Excel Table processing only uses 2 threads/cores, but it is entirely possible. The program has to be enabled to handle multiple parallel threads. Excel Lists/Tables were added long ago, at a time when 2 processes was a reasonable upper limit. And, it could be that there simply is no way to program table processing to use more than 2 threads at a time...
When I've got a large data set, I will set my Excel priority to High thru Task Manager to allow it to use more available processing. Never use RealTime priority or you're completely locked up until Excel finishes.
That is a good tip Jen...