[R] cdplot error

[wildernessness]

Fairly new at this.  
Trying to create a conditional density plot.

>cdplot(status~harvd.l,data=phy)
Error in cdplot.formula(status~harvd.l,data=phy):
dependent variable should be a factor

What does this error mean?  Status is a binary response of infestation (0/1)
and harvd.l is the log of timber harvest density per catchment.

Thanks.

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