Call:
lm(formula = df.full$diff.err ~ df.full$diff.emo)

Residuals:
    Min       1Q   Median       3Q      Max
-0.96323 -0.10255 -0.00002  0.10104  0.94691

Coefficients:
                  Estimate Std. Error t value Pr(>|t|)
(Intercept)      1.737e-05  1.647e-03   0.011    0.992
df.full$diff.emo 8.207e-01  7.924e-03 103.573   <2e-16 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 0.163 on 10060 degrees of freedom
Multiple R-squared:  0.5161,    Adjusted R-squared:  0.516
F-statistic: 1.073e+04 on 1 and 10060 DF,  p-value: < 2.2e-16