can someone please help me with locating the parameters and residuals for the fitted model with the seasonal dummy for months.

Also, how to find D12t?

below is my summary for the time series model that I generated in R:

**Call:**

**tslm(formula = arrival_ts ~ trend + season)**

**Residuals:**

** Min 1Q Median 3Q Max **

**-229.310 -39.381 -8.213 31.559 299.215 **

**Coefficients:**

** Estimate Std. Error t value Pr(>|t|) **

**(Intercept) -47.733662 6.255553 -7.631 4.77e-14 *****

**trend 0.215552 0.004647 46.383 < 2e-16 *****

**season2 2.724638 7.906092 0.345 0.730437 **

**season3 -7.753374 7.906096 -0.981 0.326949 **

**season4 -23.027697 7.886509 -2.920 0.003568 ** **

**season5 -37.784893 7.886502 -4.791 1.87e-06 *****

**season6 -37.379688 7.906158 -4.728 2.54e-06 *****

**season7 -28.093819 7.906140 -3.553 0.000395 *****

**season8 -29.759781 7.906125 -3.764 0.000175 *****

**season9 -28.293453 7.906113 -3.579 0.000359 *****

**season10 -21.454495 7.906103 -2.714 0.006751 ** **
season11 -7.438206 7.906096 -0.941 0.346989 **
season12 24.931742 7.906092 3.153 0.001654 **
---
Signif. codes: 0 ‘’ 0.001 ‘’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1*

**Residual standard error: 55.9 on 1189 degrees of freedom**

**Multiple R-squared: 0.6575, Adjusted R-squared: 0.654 **

**F-statistic: 190.2 on 12 and 1189 DF, p-value: < 2.2e-16**

Thank you