Swerling target models are special cases of the Chi-Squared target models with specific degrees of freedom. There are five different Swerling models, numbered I through V:
Read more about this topic: Chi-squared Target Models
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—Jo Swerling (b. 1897)
“But this we know, the obstacle that checked
And tripped the body, shot the spirit on
Further than target ever showed or shone.”
—Robert Frost (1874–1963)
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—Samuel Butler (1835–1902)