I have the following result from doing some descriptive statistics on my data:
> psych::describeBy(mydata_young$length, mydata_young$Strain)
Descriptive statistics by group
group: Hubbard
vars n mean sd median trimmed mad min max range skew kurtosis se
X1 1 18 93.07 4.97 93.5 93.19 3.71 82.6 101.5 18.9 -0.33 -0.63 1.17
---------------------------------------------------------------
group: Ross
vars n mean sd median trimmed mad min max range skew kurtosis se
X1 1 43 90.61 5.08 91 90.53 4.15 81.1 102.9 21.8 0.07 -0.41 0.77
How do I convert these two separate standard errors into one pooled standard error of the mean? Is there a command, or an easy way to do it by hand?