Remove QuantEcon from using where not required (#219)

Author: jlperla

lectures/dynamic_programming/coleman_policy_iter.md

@@ -377,7 +377,7 @@ Here's some code that implements the Coleman operator.
 tags: [hide-output]
 ---
 using LinearAlgebra, Statistics
-using BenchmarkTools, Interpolations, LaTeXStrings, Parameters, Plots, QuantEcon, Roots
+using BenchmarkTools, Interpolations, LaTeXStrings, Parameters, Plots, Roots
 using Optim, Random
 ```
 
@@ -389,8 +389,7 @@ using Test
 ```
 
 ```{code-cell} julia
-using BenchmarkTools, Interpolations, Parameters, Plots, QuantEcon, Roots
-
+using BenchmarkTools, Interpolations, Parameters, Plots, Roots
 
 ```
 

lectures/dynamic_programming/egm_policy_iter.md

@@ -143,7 +143,7 @@ Here's an implementation of $K$ using EGM as described above.
 
 ```{code-cell} julia
 using LinearAlgebra, Statistics
-using BenchmarkTools, Interpolations, LaTeXStrings, Parameters, Plots, QuantEcon, Random, Roots
+using BenchmarkTools, Interpolations, LaTeXStrings, Parameters, Plots, Random, Roots
 
 ```
 

lectures/dynamic_programming/jv.md

@@ -44,7 +44,7 @@ kernelspec:
 tags: [hide-output]
 ---
 using LinearAlgebra, Statistics
-using Distributions, QuantEcon, Interpolations, Expectations, Parameters
+using Distributions, Interpolations, Expectations, Parameters
 using LaTeXStrings, Plots, NLsolve, Random
 
 ```
@@ -184,8 +184,6 @@ using Test
 ```
 
 ```{code-cell} julia
-using Distributions, QuantEcon, Interpolations, Expectations, Parameters
-
   # model object
   function JvWorker(;A = 1.4,
               α = 0.6,

lectures/dynamic_programming/optgrowth.md

@@ -464,7 +464,7 @@ The next figure illustrates piecewise linear interpolation of an arbitrary funct
 tags: [hide-output]
 ---
 using LinearAlgebra, Statistics
-using LaTeXStrings, Plots, QuantEcon, Interpolations, NLsolve, Optim, Random, Parameters
+using LaTeXStrings, Plots, Interpolations, NLsolve, Optim, Random, Parameters
 using Optim: maximum, maximizer
 ```
 

lectures/multi_agent_models/lucas_model.md

@@ -387,7 +387,7 @@ using Test
 
 ```{code-cell} julia
 using LinearAlgebra, Statistics
-using Distributions, Interpolations, LaTeXStrings, Parameters, Plots, QuantEcon, Random
+using Distributions, Interpolations, LaTeXStrings, Parameters, Plots, Random
 
 ```