I work with passenger counting in a rail-company, and I have a question.
We only have automatic passenger counting system in on train, and that train doesnt go every hour of the day.
Here you see a table of when I have data, and when I dont have data:
I want to generate/calculate numbers in the white fields, based on the other fields, so we can have more correct total numbers of passengers.
Is this possible?
You can try to Pad data using IFNULL inbuilt Function.
IFNULL(SUM([NUMBER_OF_PASSENGER]),WINDOW_AVG(SUM([NUMBER_OF_PASSENGER])))
Instead of WINDOW_AVG you might select any other Analytics you want like WINDOW_SUM , WINDOW_MAX etc, whatever fits best .
Remember this is table calculation so your original measure must be there in the Sheet, you can hide it later in the viz .
Let me know if this works for you.
Related
I am trying to show the change in moving average by county on a map.
Currently, I have the calculated field for this:
IF ISNULL(LOOKUP(SUM([Covid Count]),-14)) THEN NULL ELSE
WINDOW_AVG(SUM([Covid Count]), -7, 0)-WINDOW_AVG(SUM([Covid Count]), -14, -7)
END
This works in creating a line graph where I filter the dates to only include 15 consecutive dates. This results in one point with the correct change in average.
I would like this to number to be plotted on a map but it says there are just null values.
The formula is only one part of defining a table calculation (a class of calculations performed client side tableau taking the aggregate query results returned from the data source)
Equally critical are the dimensions in play on the view to determine the level of detail of the query, and the instructions you provide to tell Tableau how to slice up or layout the query results before applying the table calc formula. This critical step is known as setting the “partitioning and addressing” for the table calc, sometimes also as setting the “compute using”. Read about it in the online help for table calcs. You can experiment with using the Edit Table Calc dialog by clicking on the corresponding pill.
In short, you probably have to a dimension, such as your Date field to some shelf - likely the detail shelf, and the set the partitioning and addressing, probably to partition by county and address by state.
If you have more than a couple of weeks of data, then you’ll get multiple marks per county. You may need to decide how to handle that on your map.
I am trying to display a graph that shows the increase or decrease in percentage of calls from each country over time (sample data and desired output below). This is intended to answer the question, "Has the proportion of calls within the USA compared to the others gone up or down in the past week?", not to be confused with answering the question if USA has just seen more calls.
In the example below, I am looking for a bar chart that shows increases/decreases for all of the countries (x-axis = country, y-axis = percent difference)
I understand how to do this based on a simple change in count, but am struggling to look at this as percent of the total.
Sounds like you want to do a Table Calc on a table calc. No problems to do this. I suggest creating the first calculated field and saving it as a new calculation. Then use that field within your final table calculation.
If you're creating the table calculation using the Quick Table Calculation, double click in the pill to see the underlying formula - you can copy this out and paste into a new calculated field.
You are also able to set the "Compute Using" separately using this method, which may be useful in this example.
I would like to sort this scatter plot, which is summarized with a Band that includes Minimum, Average, and Maximum.
I would like to sort it in 2 ways:
by Average
by Widest Range (ie difference between Minimum and Maximum values)
Tableau Public workbook
If you can't view this or I'm not allowed to post external resources on stackoverflow, then perhaps you can show me on this screenshot what I would click to get started on the following sort
Also, bonus question, is there a way to create a control for the user to toggle between the 2 sort methods in the same chart? Or do I have to duplicate the chart with a different sort type for each?
One note is that I only have Tableau Public version since I'm evaluating the product. Until I get a paid version, I can't open a workbook file unless you publish it to Tableau Public cloud. But rather than give me the workbook answer, I would just appreciate it if you gave me instructions to do this as this is more of a learning exercise.
Thanks!
Somewhat unfortunately, you'll have to replicate the min,avg,max by creating 3 calculated fields. Tableau cannot operate on the values placed on the view via reference lines.
These calculations might look something like these:
{Fixed [Cwe]: Min([Cvss Score])}
~
{Fixed [Cwe]: Avg([Cvss Score])}
~
{Fixed [Cwe]: Max([Cvss Score])}
In general, from there, you should pretty easily be able to apply them to the view and sort. Average will be easy. The difference between Min and Max will just need a subtracting calculated field to sort by. Once they're on the view, I'd put them as a dimension (column) to verify that the numbers look correct.
Take note that LOD calculations take place before filtering, so you'll want to put the Cvss filter you have there 'on context' by right clicking it and clicking 'add to context'
Here is how I would complete the sorts:
Starting with all the above calculations on 'Rows' and ensuring that they are 'Dimensions' (Blue).
After right clicking "Sort..." on [Sub-Category] on 'Rows'. Select which field to sort by.
From there, the calculated fields can be taken off the rows column. (They were only there in the first place to ensure that you could check that the sorts took place. They don't actually need to have been there in the first place.)
I am trying to create a graph with two lines, with two filters from the same dimension.
I have a dimension which has 20+ values. I'd like one line to show data based on just one of the selected values and the other line to show a line excluding that same value.
I've tried the following:
-Creating a duplicate/copy dimension and filtering the original one with the first, and the copy with the 2nd. When I do this, the graphic disappears.
-Creating a calculated field that tries to split the measures up. This isn't letting me track the count.
I want this on the same axis; the best I've been able to do is create two sheets, one with the first filter and one with the 2nd, and stack them in a dashboard.
My end user wants the lines in the same visual, otherwise I'd be happy with the dashboard approach. Right now, though, I'd also like to know how to do this.
It is a little hard to tell exactly what you want to achieve, but the problem with filtering is common.
The principle that is important is that Tableau will filter the whole dataset by row. So duplicating the dimension you want to filter won't help as the filter on the original dimension will also filter the corresponding rows in the second dimension. Any solution has to be clever enough to work around this issue.
One solution is to build two new dimensions that use a calculation rather than a filter to create the new result. Let's say you have a dimension, [size] that has a range of numbers from 1 to 10 and you want to compare the total number of rows including and excluding the number 5. You could create a new field using a formula like if [size] <> 5 then 1 else 0 end
Summing the new field will give a count of the number of rows that don't contain a 5 and this can be compared directly to a rowcount of the original [size] field which will give the number including the value 5.
This basic principle can be extended to much more complex logic. The essential point is to realise that filters act on every row in your data and can't, by themselves, show comparisons with alternative filter choices on a single visualisation.
Depending on the nature of your problem there may be other solutions worth looking at including sets and groups but you would need to provide more specific details for users here to tell you whether they would be useful.
We can make a a set out of the values of the dimension and then place it in the required shelf. So, you will have your dimension which will plot accordingly and set which will have data as per the requirement because with filter you can't have that independence of showing data everytime you want.
We have data that is submitted that is only YTD numbers. I'm wondering how I could display numbers that are subtracted along the Date field.
Ie, if I want to show the MTD movement on March. I will have to go March less February.
Now I know I can do this for individual measure fields. But having around 40+ measures seems a bit tedious.
http://kb.tableausoftware.com/articles/knowledgebase/creating-ytd-mtd-calculations
I tried to enter "Measure Values" but that is not a valid measure to put in the calculation.
Is there a way to set up a custom dimension?
Thanks,
Gem
After days of research, can't be done in tableau unless you want to labour for a week creating an almost cell by cell calculation. Data transformation in SQL will be a more feasible solution.
I had pivoted the data previously in SQL, so that I end up with 1 measure column instead of 40+. That enables you to minimise the calculation fields, so that you don't have to repeat all the calculation for individual measures.
Works well. Not for ratios though, as you will need to extract individual measures again so that you can divide them against each other. It's got pros and cons. Number of rows in the DB also multiplies.
Other solutions that preserves the table structure will be to use temp tables and do calculations on several temp tables.