You must first specify some structural equation for the relationship between TC and LC, (and other relevant variables).  Estimate this relationship using gretl.  (How you do this depends on your model and the possible presence of other endogenous models.)   You can then easily estimate the required marginal effect.

Best regards

John   

On 25 July 2011 21:28, Anutechia Asongu <simplice_peace@yahoo.com> wrote:
Hi all,
       Say I have a two series: Total Cost(TC) and Labour Cost(LC). I wish to obtain another series for the partial derivative of TC with respect to LC (dTC/dLC). Any hint on how this could be done via Grelt.
      Thanks

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John C Frain
Economics Department
Trinity College Dublin
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