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added text in constructors.md to say NaN correlation is printed as a dot, fixes #819 #822

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added text in constructors.md to say NaN correlation is printed as a dot, fixes #819 #822

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2 changes: 1 addition & 1 deletion docs/src/constructors.md
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Expand Up @@ -185,7 +185,7 @@ fit(MixedModel, @formula(reaction ~ 1 + days + (1|subj) + (days|subj)), sleepstu
contrasts = Dict(:days => DummyCoding()))
DisplayAs.Text(ans) # hide
```
(Notice that the variance component for `days: 1` is estimated as zero, so the correlations for this component are undefined and expressed as `NaN`, not a number.)
(Notice that the variance component for `days: 1` is estimated as zero, so the correlations for this component are undefined, printed as a `.` in the output and internally represented as `NaN`, not a number.)

An alternative is to force all the levels of `days` as indicators using `fulldummy` encoding.
```@docs
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