Cannot find [Slope1] in using Linestx

[Wubin]

As shown below, I have some problems using Linestx,

which says Cannot find name [Slope1].  Power Bi Version: 2.137.1102.0 64-bit 

Somebody to tell me how to solve it? Thanks!

[Poojara_D12 · Accepted solution]

Hi @Wubin 

It looks like you're encountering an issue where Power BI's LINESTX function is not able to find the name Slope1. This usually happens due to a syntax issue or incorrect usage of the function in your formula. Let's troubleshoot this problem step by step:

Steps to Solve the Issue:

1. Check Formula Syntax: Ensure that the formula you're using for LINESTX is written correctly. Here's the general syntax for the LINESTX function:

LINESTX(<Table>, <Y values>, <X values>, <Const>, <Stats>)

• <Table>: The table that contains the data.
• <Y values>: The dependent variable (what you are trying to predict).
• <X values>: The independent variable (predictor).
• <Const>: Optional. If set to TRUE, the intercept is calculated normally; if FALSE, the intercept is forced to zero.
• <Stats>: Optional. If TRUE, additional regression statistics are returned.

• Verify the Column Names: If you're using Slope1 in your LINESTX formula, ensure that:

  • The column or field name Slope1 exists in your data model.
  • It’s properly referenced within your DAX formula.

  For example, if Slope1 is a calculated column or measure, make sure you're referring to it correctly like this:

LINESTX(MyTable, MyTable[YValues], MyTable[XValues])

1. If Slope1 is supposed to be a reference to a calculated column or measure, ensure that it's available within the scope of your model.

2. Check for Case Sensitivity: DAX is case-insensitive for column names, but sometimes, referencing issues arise if the column is part of another table or if there are multiple similarly named columns. Make sure the exact name you’re referencing is correct.

3. Recreate the Column or Measure: If the column or measure Slope1 is a custom one, try recalculating or recreating it, as it might not have been correctly created in your model.

4. Rebuild the DAX Query: If you're working with a complex formula or referencing other DAX measures, try breaking down the formula and testing it step-by-step to ensure that all variables and measures are correctly defined.

Example of Correct Usage:

MyLine = LINESTX(MyTable, MyTable[Sales], MyTable[Months])

In this example, Sales is the dependent variable and Months is the independent variable.

If these steps don't resolve the issue, could you share the exact formula you're using? That way, I can provide a more targeted solution.

Did I answer your question? Mark my post as a solution, this will help others!

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Kind Regards,
Poojara
Data Analyst | MSBI Developer | Power BI Consultant
YouTube: https://youtube.com/@biconcepts?si=04iw9SYI2HN80HKS

[Wubin]

Dear Poojara_D12,

       Thanks for your help.

       Is [Slope1] a column of Linestx()? 

       I want to copy the sample below, but it failed.

==  sample ==

LinearRegression =

VAR line =

LINESTX (

ALL ( Sales[Quantity] ),

[Avg Price],

Sales[Quantity]

)

VAR slope = SELECTCOLUMNS ( line, [Slope1] )

VAR intercept = SELECTCOLUMNS ( line, [Intercept] )

VAR x = SELECTEDVALUE ( Sales[Quantity] )

VAR y = x * slope + intercept

RETURN y

[Poojara_D12]

Hi @Wubin 

The [Slope1] column does not exist in LINESTX(); it returns a table with regression statistics. To extract the slope and intercept, use the correct index values from the table.

LinearRegression = 
VAR line = LINESTX ( ALL ( Sales[Quantity] ), [Avg Price], Sales[Quantity] )
VAR slope = line[1]  // Slope (first value)
VAR intercept = line[2]  // Intercept (second value)
VAR x = SELECTEDVALUE ( Sales[Quantity] )
VAR y = x * slope + intercept
RETURN y

This will correctly compute the predicted Avg Price based on the linear regression formula.

Did I answer your question? Mark my post as a solution, this will help others!

If my response(s) assisted you in any way, don't forget to drop me a "Kudos" 🙂

Kind Regards,
Poojara
Data Analyst | MSBI Developer | Power BI Consultant
YouTube: https://youtube.com/@biconcepts?si=04iw9SYI2HN80HKS

[Wubin]

Hi Sir,

The Error says as below Cannot find the table defined by Linestx().

[Poojara_D12]

Hi @Wubin 

Ensure that:

• The table passed to LINESTX() is correct.
• You're referencing the correct column or index for the slope and intercept.
• Your data doesn't contain issues like nulls or non-numeric values.

If the error persists, try checking for potential data issues or providing more context about the dataset for a deeper investigation.

[Wubin]

Hi, @Poojara_D12 

In the DAX Query View, it works,

Thank you very much for your kindly help.

I will check the points you mentioned.