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fix typo in within-group transformation definition for PLPR model #276

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fix typo in within-group transformation definition for PLPR model #276

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2 changes: 1 addition & 1 deletion doc/guide/models/plm/plpr.rst
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Expand Up @@ -93,7 +93,7 @@ where :math:`a_i`, :math:`c_i` are random effects and covariate unit means
These approaches remove individual heterogeneity from the model by transforming the data.
For some random variable :math:`W_{it}`, define the First-Difference (FD) transformation
:math:`Q(W_{it}) = W_{it} - W_{it-1}` (for :math:`t=2, \dots, T`), and the Within-Group (WG)
transformation :math:`Q(W_{it}) = X_{it} - \bar{X}_{i}`, where :math:`\bar{W}_{i} = T^{-1} \sum_{t=1}^T W_{it}`.
transformation :math:`Q(W_{it}) = W_{it} - \bar{W}_{i}`, where :math:`\bar{W}_{i} = T^{-1} \sum_{t=1}^T W_{it}`.

The PLPR model under the transformation approaches takes the form

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