I am trying to apply a filter in one column model_number and then the maximum number of the other filed, Week.
This is the formula that I tried.
=if(WildMatch(model_number,'*4*'),Max(Week,1))
Does anyone can help me to formulate this?
You can use set analysis to filter the data.
In your case the expression can be written in this way:
max( {< model_number = {"*4*"} >} Week, 1)
The max function will be calculated only on the records that fulfil the condition applied on model_number field.
Related
I have researched this problem and have found the answer for a single query, where you can find the nth value of a single column by using DESC OFFSET 2. What I am trying to do is find the nth value for each item in a row. For example, I'm working with a data base concerning bike share data. The data base stores the duration of each trip and the date. I'm trying to find the 3rd longest duration for each day in a data base. If I was going to find the max duration I would use the following code.
SELECT DATE(start_date) trip_date, MAX(duration)
FROM trips
GROUP BY 1
I want the output to be something like this.
Date 3rd_duration
1/1/2017 334
1/2/2017 587
etc
If the value of the third longest duration is the same for two or more different trips, I would like the trip with the lowest trip_id to be ranked 3rd.
I'm working in SQLite.
Any help would be appreciated.
Neither SQLite nor MySQL have a ROW_NUMBER function built in, so get ready for an ugly query. We can still group by the date, but to find the max duration we can use a correlated subquery.
SELECT
DATE(t1.start_date) AS start_date,
t1.duration
FROM trips t1
WHERE
(SELECT COUNT(*) FROM trips t2
WHERE DATE(t2.start_date) = DATE(t1.start_date) AND
t2.duration <= t1.duration) = 3;
Note that this approach might break down if you could have, for a given date, more than one record with the same duration. In this case, you might get multiple results, neither of which might actually be the third highest duration. In order to handle such ties, you should tell us what the logic is with regard to ties.
Demo here:
Rextester
I'd like to have a Calculated Column in a table that counts the instances of a concatenation.
I get the following error when inputting Abs(Count([concat])) as the column formula for the calculation: The expression Abs(Count([concat])) cannot be used in a calculated column.
Is there any other way to do it without doing a query? I'm pretty sure it can't be done but I figured I'd ask anyways since I didn't see any other posts about it.
No, and even if there was, you should create and use a query for this.
Besides, applying Abs on a count doesn't make much sense, as the count cannot be negative.
I have extensively read and re-read the Troubleshooting R Connections and Tableau and R Integration help documents, but as a new Tableau user they just aren't helping me.
I need to be able to calculate Kaplan-Meier survival probabilities across any dimensions that are dragged onto the sheet. Ideally, I would be able to retrieve this in a tabular format at multiple time points, but for now, I would be happy just to get it at a single time point.
My data in Tableau have columns for [event-boolean] and [time to event]. Let's say I also have columns for Gender and District.
Currently, I have a calculated field [surv] as:
SCRIPT_REAL('
library(survival);
fit <- summary(survfit(Surv(.arg2,.arg1) ~ 1), times=365);
fit$surv'
, min([event-boolean])
, min([time to event])
)
I have messed with Computed Using, Addressing, Partitions, Aggregate Measures, and parameters to the R function, but no combination I have tried has worked.
If [District] is in Columns, do I need to change my SCRIPT_REAL call or do I just need to change some other combination of levers?
I used Andrew's solution to solve this problem. Essentially,
- Turn off Aggregate Measures
- In the Measure Values shelf, select Compute Using > Cell
- In the calculated field, start with If FIRST() == 0 script_*() END
- Ctrl+drag the measure to the Filters shelf and use a Special > Non-null filter.
I was wondering if there was a Graphite function or a way of getting the number of points above a certain value. Let's say I have 2,44,24,522,52,534 for the same time and I want to get the number of points over 40, in this case it would be 3. Any tips?
Thanks
You can use removeBelowValue(your.metric, 40) to only display points above 40.
Then use something to make non zero value equal to 1 (I am thinking of pow(_, 0) but I am not sure of how it behaves with None values given by removeBelowValue). If you use recent (>0.9.x) version of graphite, you can use isNonNull instead of pow
In the end you can use any function to summarize your the 1s you have, summarize you should be good. You only have to select your range.
Suggestion : summarize(pow(removeBelowValue(your.metric,40),0), '1hour', 'sumSeries')
I have a data set in BIRT Designer with two columns, one with day of week abbreviation names (Su, M, Tu, etc.) and the other with numerical representations of those days of the week starting at 0 and going to 6 (0, 1, 2, etc.). I want to determine what percentage of the total number of rows that each day of week represents. For example, if I have 100 total rows and 12 of those rows correspond to Su/0, 12% of the total rows are made up of Su.
I would like to perform this same calculation within BIRT and graph (bar graph) those percentages that each day consists of out of the total. I'm just learning how to use BIRT and assume that I need to do some scripting either when making my data set or when specifying the rows when making the chart. Any tips would be greatly appreciated.
Use computed columns.
Edit Data set > Computed Columns
The simplest way is to put one column that counts every row, for each day of the week. You can have a separate column that adds a count if the day of the week is a specific values
if (row["Day"] == "Su"){
1
}
I should add: that you can use a 'data' element in your table to compute the percentage. A 'Dynamic Text' item could also be used, but the data item gives you a binded value that you can make better use of later if needed.
Edit
To get a total row count, us a computed column I name mine 'All'
For the Expression use the value "1"
With some inspiration from James Jenkins I think I found my answer. It was pretty simple in the end, but all I needed to do was make a new computed column and instead of adding an expression, I simply set the Aggregation to "COUNT". That counts all of the rows in your table and puts that total on each row. That way you can use that total in any calculations that you may need to do. I have added a screenshot for clarity.