**Local Sensitivity Analysis** - It is a method to investigates the effect of small change in a parameter (input) of a model to its output (result). Mathematically this is:
@@0@@

Where @@1@@ is result or output, @@2@@ is parameter with subscript representing @@3@@-parameter. Since a small change in the parameter is to be considered, the limiting value can be considered, i,e, @@4@@. This makes the above equation an ODE, which for the right side is: @@5@@

Solving the ODE and multiplying by factor @@6@@.

Below we perform the above operations for our fit-model (S-shaped)

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Now we need to choose fixed values for @@0@@, @@1@@ and @@2@@ and letting @@3@@ be the original value. Let @@4@@, @@5@@, @@6@@ and let @@7@@

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Next we do the same above exercise using other parameters. Let's say next we want to check with parameter @@0@@. Then first we get the differential @@1@@. Finally functional plots.

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Now you can assign different values for @@0@@ and @@1@@ and continue as done above.