Forum Discussion

Wubin's avatar
Wubin
New Member
1 year ago
Solved

Cannot find [Slope1] in using Linestx

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's avatar
    Poojara_D12
    1 year ago

    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!

    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

     

6 Replies

  • Poojara_D12's avatar
    Poojara_D12
    Super User
    1 year ago

    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!

    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's avatar
      Wubin
      New Member
      1 year ago

      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's avatar
        Poojara_D12
        Super User
        1 year ago

        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