I have 25 different trend lines. I'm interested in rate of change, which will be given by the slope of these lines.
While searching on the internet, i came across this interesting post, What good can come from averaging a slope.
They are talking about average of slope of 2 lines. I want a trend line that is showing the general trend followed by these 25 lines. Can I imply take the arithmetic mean of these slopes? If not, then what is the possible solution?