Update model-basics.Rmd (#765)

Added second colon to 'MASS:rlm()' -> 'MASS::rlm()'
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MattWittbrodt 2020-01-15 13:37:06 -05:00 committed by Hadley Wickham
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@ -670,7 +670,7 @@ This chapter has focussed exclusively on the class of linear models, which assum
between the parameter vector and the origin). This tends to make
models that generalise better to new datasets from the same population.
* __Robust linear models__, e.g. `MASS:rlm()`, tweak the distance to downweight
* __Robust linear models__, e.g. `MASS::rlm()`, tweak the distance to downweight
points that are very far away. This makes them less sensitive to the presence
of outliers, at the cost of being not quite as good when there are no
outliers.