differenes in differences model

analysis/analysis/output/analysis_results.md

@@ -25,23 +25,23 @@
 | max   |            2232       |
 
 ## Historical Spills Response Time Summary:
-| Period         |   count |    mean |      std |   min |   25% |   50% |   75% |   max |
-|:---------------|--------:|--------:|---------:|------:|------:|------:|------:|------:|
-| 2021 and After |    2451 | 10.1816 |  96.0115 |     0 |     0 |     0 |     1 |  2501 |
-| Before 2021    |    2861 | 31.1779 | 265.348  |     0 |     0 |     1 |     2 |  9261 |
+| Period         |   count |    mean |     std |   min |   25% |   50% |   75% |   max |
+|:---------------|--------:|--------:|--------:|------:|------:|------:|------:|------:|
+| 2020 and After |    2705 | 13.5331 | 200.352 |     0 |     0 |     0 |     1 |  9261 |
+| Before 2020    |    2607 | 29.7461 | 210.659 |     0 |     0 |     1 |     2 |  5681 |
 
 ## Recent Spills Response Time Summary:
 | Period         |   count |    mean |     std |   min |   25% |   50% |   75% |   max |
 |:---------------|--------:|--------:|--------:|------:|------:|------:|------:|------:|
-| 2021 and After |    3552 | 2.92877 | 28.8645 |     0 |     0 |     1 |     1 |  1329 |
-| Before 2021    |    7126 | 4.48077 | 53.7949 |     0 |     0 |     1 |     2 |  2232 |
+| 2020 and After |    4472 | 2.92688 | 27.3021 |     0 |     0 |     1 |     1 |  1329 |
+| Before 2020    |    6206 | 4.71221 | 57.1161 |     0 |     1 |     1 |     2 |  2232 |
 
 ## T-Test Results for Historical Spills
-T-Statistic: 3.9419
-P-Value: 0.0001
+T-Statistic: 2.8723
+P-Value: 0.0041
 The difference in response time for historical spills is statistically significant.
 
 ## T-Test Results for Recent Spills
-T-Statistic: 1.9390
-P-Value: 0.0525
-The difference in response time for recent spills is not statistically significant.
+T-Statistic: 2.1457
+P-Value: 0.0319
+The difference in response time for recent spills is statistically significant.

analysis/analysis/output/model_summaries.md

@@ -0,0 +1,56 @@
+# Model Summaries
+
+## Historical Spills Model Summary:
+                               OLS Regression Results                               
+====================================================================================
+Dep. Variable:     Q("Report Delay (Days)")   R-squared:                       0.002
+Model:                                  OLS   Adj. R-squared:                  0.001
+Method:                       Least Squares   F-statistic:                     8.265
+Date:                      Mon, 31 Mar 2025   Prob (F-statistic):            0.00406
+Time:                              13:58:43   Log-Likelihood:                -35825.
+No. Observations:                      5312   AIC:                         7.165e+04
+Df Residuals:                          5310   BIC:                         7.167e+04
+Df Model:                                 1                                         
+Covariance Type:                  nonrobust                                         
+==============================================================================
+                 coef    std err          t      P>|t|      [0.025      0.975]
+------------------------------------------------------------------------------
+Intercept     29.7461      4.024      7.392      0.000      21.857      37.635
+Post2020     -16.2130      5.639     -2.875      0.004     -27.269      -5.157
+==============================================================================
+Omnibus:                    12943.048   Durbin-Watson:                   1.944
+Prob(Omnibus):                  0.000   Jarque-Bera (JB):        189644913.057
+Skew:                          25.310   Prob(JB):                         0.00
+Kurtosis:                     927.266   Cond. No.                         2.64
+==============================================================================
+
+Notes:
+[1] Standard Errors assume that the covariance matrix of the errors is correctly specified.
+
+## Recent Spills Model Summary:
+                               OLS Regression Results                               
+====================================================================================
+Dep. Variable:     Q("Report Delay (Days)")   R-squared:                       0.000
+Model:                                  OLS   Adj. R-squared:                  0.000
+Method:                       Least Squares   F-statistic:                     3.752
+Date:                      Mon, 31 Mar 2025   Prob (F-statistic):             0.0528
+Time:                              13:58:43   Log-Likelihood:                -56260.
+No. Observations:                     10678   AIC:                         1.125e+05
+Df Residuals:                         10676   BIC:                         1.125e+05
+Df Model:                                 1                                         
+Covariance Type:                  nonrobust                                         
+==============================================================================
+                 coef    std err          t      P>|t|      [0.025      0.975]
+------------------------------------------------------------------------------
+Intercept      4.7122      0.597      7.900      0.000       3.543       5.881
+Post2020      -1.7853      0.922     -1.937      0.053      -3.592       0.021
+==============================================================================
+Omnibus:                    28541.449   Durbin-Watson:                   1.643
+Prob(Omnibus):                  0.000   Jarque-Bera (JB):        676851501.928
+Skew:                          32.390   Prob(JB):                         0.00
+Kurtosis:                    1234.707   Cond. No.                         2.47
+==============================================================================
+
+Notes:
+[1] Standard Errors assume that the covariance matrix of the errors is correctly specified.
+

analysis/analysis/output/response_time_summary.md

@@ -1,6 +1,6 @@
 # Response Time Summary
 
-| Period         |   count |     mean |      std |   min |   25% |   50% |   75% |   max |
-|:---------------|--------:|---------:|---------:|------:|------:|------:|------:|------:|
-| 2021 and After |    6003 |  5.89005 |  65.3336 |     0 |     0 |     1 |     1 |  2501 |
-| Before 2021    |    9987 | 12.1288  | 149.586  |     0 |     0 |     1 |     2 |  9261 |
+| Period         |   count |     mean |     std |   min |   25% |   50% |   75% |   max |
+|:---------------|--------:|---------:|--------:|------:|------:|------:|------:|------:|
+| 2020 and After |    7177 |  6.92434 | 124.966 |     0 |     0 |     1 |     1 |  9261 |
+| Before 2020    |    8813 | 12.1176  | 124.706 |     0 |     0 |     1 |     2 |  5681 |

analysis/analysis/output/t_test_results.md

@@ -1,9 +1,9 @@
 ## T-Test Results for Historical Spills
-T-Statistic: 3.9419
-P-Value: 0.0001
+T-Statistic: 2.8723
+P-Value: 0.0041
 The difference in response time for historical spills is statistically significant.
 
 ## T-Test Results for Recent Spills
-T-Statistic: 1.9390
-P-Value: 0.0525
-The difference in response time for recent spills is not statistically significant.
+T-Statistic: 2.1457
+P-Value: 0.0319
+The difference in response time for recent spills is statistically significant.