I'm trying to make a formula and I got the error: $ operator not defined for this S4 class with R. First of all, what is a S4 class? What am I doing wrong
ggseasonplot
angular-template-form
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fsspec
asyncapi
survminer
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zend-framework3
jmap
azure-identity
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lync-2013
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parboiled
flvplayer
chromecast
excel-addins
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quickform
uisplitviewcontroller
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