
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
When determining whether two variables, y and x, are related, four different models were chosen. Their coefficients of determination, $R^2$, are as follows: Model 1, $R^2=0.98$; Model 2, $R^2=0.80$; Model 3, $R^2=0.50$; Model 4, $R^2=0.25$. Determine the model with the best fitting effect.

Present the answer in LaTex format: \boxed{Your answer}
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