# SPSS Statistics

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## Exponential Decay #SPSS Statistics # global ai and datascience

• #### 1.  Exponential Decay #SPSS Statistics # global ai and datascience

Posted Thu March 16, 2023 09:59 AM

Please advise on the basic steps one can use to conduct an Exponential decay using SPSS v29. #SPSSStatistics #GlobalAIandDataScience

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Carol Omara
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• #### 2.  RE: Exponential Decay #SPSS Statistics # global ai and datascience

Posted Fri March 17, 2023 09:06 AM

From one of our statisticians:

"She can fit the nonlinear models in NLR/CNLR."

See here for the Syntax Reference on that.

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Rick Marcantonio
Quality Assurance
IBM
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• #### 3.  RE: Exponential Decay #SPSS Statistics # global ai and datascience

Posted Fri March 17, 2023 12:00 PM

Thank you Rick for the advice. Since I am not an advanced statistician. Would you care to tell me how I conduct this in SPSS.

I had a look at the Syntax reference, but I am not sure how to proceed from here or how to execute the Syntax in SPSS.

May I ask you to please guide me? Is it Analyze > Regression > Nonlinear? If I do not know what a and b estimates are, will it be possible to run without knowing their values? If not, how do I determine the a and b values. I understand that b must be greater than 0 and not equal to 1, what about a and c?

I am trying with this formula y = A1 *exp(-x/t1t) + y0 . It is my first time attempting exponential decay.

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Carol Omara
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• #### 4.  RE: Exponential Decay #SPSS Statistics # global ai and datascience

Posted Fri March 17, 2023 12:47 PM

Hi again, Carol.

I'm afraid I can't do that, as I am no expert myself. Please try these tutorials and see if they help you:

NonLinear 1

NonLinear 2

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Rick Marcantonio
Quality Assurance
IBM
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• #### 5.  RE: Exponential Decay #SPSS Statistics # global ai and datascience

IBM Champion
Posted Fri March 17, 2023 01:02 PM

You might want to start with the simpler Analyze > Regression > Curve Estimation procedure.  It includes an exponential functional form as an option.

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Jon Peck
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• #### 6.  RE: Exponential Decay #SPSS Statistics # global ai and datascience

Posted Fri March 17, 2023 03:57 PM

Thank you, I tried the curve estimation. Since I have more than 3 treatments, I placed the treatments under dependent, and week in the variable, I ticked exponential, power, linear and display ANOVA table. Thank you.

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Carol Omara
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