What is the equaton for ARIMAX(1,1,1) and how can I undifference the 1st differenced data to fit the equation?
52681
Formula for an ARIMA(1,1,1) solving for y
91918
\eqref to give reference to a sequence of subequations
43834
Simple Complex Number Problem: $1 = -1$
71082
How to find a good fit for semi-sinusoidal model in R?
103276
Solving an equation over the reals: $ x^3 + 1 = 2\sqrt[3]{{2x - 1}}$
88137
$y''-2y'+y=te^t$ by method of undetermined coefficients
32833
Matrix is either null or similar to the elementary matrix $E_{2,1}$
37453
Mgf of double exponential RV
62481
Log or square-root transformation for ARIMA
104970
How to dequantify units in mathematica?
116581
Quadratic models with R. The use of poly(..) and I(..) functions (R-language)
30245
Finding distributions on $\mathbb{R^2}$ constrained by 2 equations.
114098
Difference time series before Arima or within Arima
132879
Matlab questions about $a_{n+1} = 4a_{n} + n +1$
110461
Fitting data without an equation
144841
Find general solution $y''y^3=1$
42773
How to minimize residual sum of squares of an exponential fit?