Call:
lm(formula = ydata ~ xdata)

Residuals:
    Min      1Q  Median      3Q     Max
-4.5401 -1.3643  0.1956  1.8130  3.1046

Coefficients:
            Estimate Std. Error t value Pr(>|t|)
(Intercept) 3.188580   1.015338   3.140  0.00632 **
xdata       0.048447   0.008045   6.022 1.78e-05 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 2.297 on 16 degrees of freedom
  (17343 observations deleted due to missingness)
Multiple R-squared:  0.6939,    Adjusted R-squared:  0.6748
F-statistic: 36.27 on 1 and 16 DF,  p-value: 1.776e-05