Inside a Jasper report, I'd like to have something with two non-cumulative variables (computed for each record) :
var_age : a calculation of age based upon elements of the current record.
var_sanitized_age : something that takes var_age and changes its value if needed
So far it seems to me that I can't control in which order these variables will be computed. And that this could have var_sanitized_age either use var_age's previous value, or fail.
Is there a way to have Jasper correctly compute one variable, with an expression that uses the values of one or several other variables ?
And as a natural extension to this question, could I define a cumulative variable named var_sanitized_age_average that would reliably average upon one of the variable's latest value ?
Variables are computed in the order in which they are declared in the report/dataset.
Therefore if var_sanitized_age depends on var_age, you need to be declare var_sanitized_age after var_age.
Computing the average of var_sanitized_age as var_sanitized_age_average would also work as long as the variables are declared in this order.
Related
Self-taught at SPSS here. Need to know the appropriate syntax to recode four DATE variables into one, based on which would be the latest date. I have four DATE variables in a dataset with 165 cases:
wnd_heal_date
wnd_heal_d14_date
wnd_heal_d30_date
wnd_heal_3m_date
And each variable may or may not contain a value for each case. I want to recode a new variable which scans the dates from all four and only selects the one that is the latest and puts it into a new variable (x_final_wound_heal_date).
How to use the SELECT IF function for this purpose?
select if function selects rows in the data, and so is not appropriate for this case. What you can do is this instead:
compute x_final_wound_heal_date =
max(wnd_heal_date, wnd_heal_d14_date, wnd_heal_d30_date, wnd_heal_3m_date).
VARIABLE LABELS x_final_wnd_heal_date 'Time to definitive wound healing (days)'.
VARIABLE LEVEL x_final_wnd_heal_date(SCALE).
ALTER TYPE x_final_wnd_heal_date(DATE11).
This will put the latest of available date values in the new variable.
I need help on a basic calculation that I'm unable to figure on Tableau.
I am trying to setup a calculated field that has dependency on its previous value to calculate its current value. Here is a simple example from Excel -
Sample Exhibit
As you can see, each value in a row is dependent on its previous value and multiplied by a constant.
In Tableau, when I'm trying to create a calculated field, it is not letting me refer to itself (-1 lagged value) in the code. I'd appreciate any help on how this can be resolved. Thanks in advance!
Tableau can do this client side with a table calc. You’ll have to learn how table calcs operate from the help- especially partitioning and addressing. Then you can use the function Previous_Value() to refer to the previous value. Practice on something simple first to make sure you understand how previous value() works. Hint, the argument to that function doesn’t mean what most people assume it means
If you want to perform this calculation server side instead, then you’ll need to use custom SQL so you can specify an analytic aka windowing query
Check the LOOKUP field to get the value from the preceding row. For example: LOOKUP(SUM([Value]),-1)
https://help.tableau.com/current/pro/desktop/en-us/functions_functions_tablecalculation.htm#lookupexpression-offset
You may need to make yourself familiar with the Table Calculation partitioning if not getting the expected result.
I need to create a Dimension (calculated field) that depends on a filter.
My dataset has four columns: ID (Int), Variable Name (String), Value (Int) and Client ID (String). For each client ID there will be a value for each type of variable.
There are 6 types of Variable Name, and for each row there is unique ID.
I'm using a filter by Variable Name so there is one, and only one variable type available at the same time.
In order to display it in a stacked bar chart by that dimension, I have created this calculation field (In reality if has six IFs, but I'll use just one to illustrated it):
IF ATTR([1 (ML_Output)].[Variable Name])= "Interest Rate" THEN [Interest Rate] END
That way, when the filter is in "Monthly Interest Rate", the ATTR function should show the only type of variable available in the Variable Name field, which would be "Monthly Interest Rate". The problem is that it shows the "Cannot mix aggregate and non-aggregate arguments with this function" error.
I've been trying to solve this with many tutorials, but none of them work for one reason of another.
Any ideas?
EDIT:
PS: The original calculation that was doing what I wanted used a Parameter. However, since parameters won't update automatically when the dataset changes, I can't use it anymore. The original calculation was:
IF [Parameter 1]="Interest Rate" THEN [Interest Rate] END
I need the calculated field as a dimension. So, if I aggregated the result of the calculation, then it would be a measure, and that can't be used to create a stacked bar.
My end goal is to have a box change color when the last 3 records input into a field (based on the time of input) in FileMaker achieve a certain criteria (ex. variance < 2). I would like to know how to make this happen, or how a calculation/script can be written to only look at the last 3 records.
There are several ways you could approach this. A simple one would be to use a script to:
Show all records in the given table;
Unsort them (assuming they were entered in chronological order; otherwise sort them by creation timestamp);
Omit all records except the last three;
Get the value of a summary field defined as Standard Deviation of your value field;
Set a global variable/field to the square of the returned value.
Then use the global variable/field to conditionally format your "box".
If you don't want to use a script, you will have to define a relationship in order to get the last three values in the table, regardless of the current found set and/or sort order. Or you may use the ExecuteSQL() function for this.
I have a variable which stores the calculated average of a specific field.
Is there any way to use this variable in the Title band? When I try to do it, I just get null in the Title but the correct value in the Column Footer.
The only other possibility for this I see is, to precalculate it in Java and pass it as an argument, but I'm trying to avoid that.
I'm using JasperReports and iReport in version 3.7.4.
The Variable and the Text Field both have the property Evaluation Time. Set it to Report for both and it works.
Also look at http://jasperforge.org/plugins/espforum/view.php?group_id=83&forumid=101&topicid=67697