Add regression output text file.

.gitattributes.txt

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+# Set default behavior, in case users don't have core.autocrlf set.
+* text=auto
+
+# Explicitly declare text files you want to always be normalized and converted
+# to native line endings on checkout.
+*.c text
+*.h text
+*.json text
+*.txt text
+
+# Declare files that will always have LF line endings on checkout.
+*.sh text eol=lf
+
+# Denote all files that are truly binary and should not be modified.
+*.png binary
+*.jpg binary
+*.gif binary

notebooks/regression.txt

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+Temperature differences - t-statistic: -0.69962809136618, p-value: 0.48483154381081073
+PCI differences - t-statistic: -0.8894896300814626, p-value: 0.3746653616580382
+Not enough data for tax significance test.