Jining- I'd like to submit section 3 for this peer review cycle.

General Comments: 
I am reviewing up to section 3.2 here. 

Specific Comments: 

3, Paragraph 1: Since we want to introduce the term "Galaxy Morphology
Evolution", it makes since to put this in the stress position of the
first sentence. eg: "The change in a galaxies appearence over time is
denoted as galaxy morphology evolution" Overall, good
apragraph. INtroduces the reponse (summary statistics) and independent
variables.

3, P2: I think this paragraph can be split into three different
paragraphs, the first discussing the major problems: eh: Why this
isn't just a straightforward regression problem. The next introducing
the Bin approach often used by astromers, and finally the continuous
approach you used. To me, it seems like there are three different
stories in this single paragraph, and splitting it would each the
readers burden.

3.1, P1: Maybe make clear that; We need redshift to be continuous in
order to deal with uncertainty in its measurements, so we need to
convert from the discrete data provided to the full probability
density. Also, instead of "some properties of probability
distributions", it would help to mention the specific properties.

Overall, it would seem like methods would flow better with:
Description of discrete Bin, Description of continuous bin. While this
description is important to include, maybe it makes more sense as a
\subsubsection in the discrete or continuous section, as opposed to
it's own.

3.2- Add some text between 3.2 and 3.2.1. Maybe just introduce "This
is the method used by astronomers" and explain the rationale and why
it's necessary to improve on this.

3.2.1, P1: The goal here is to describe how we assign galaxies into
groups. From this, we should put "groups" in the stress position of
sentence one: "We want to use the redshift to map galaxies into
groups". The confusing part of this sentence reading it without
section 1-2, is that I'm unclear what band filter and wavelength's
here mean.

3.2: What would make a wavelength "interesting to us"? It may help to
include an example here specifying what this means.

The rest of the section now specifies precisely how this method
assigns galaxies to groups using redshift. Since there's a lot of
concrete steps here, it may help to simply set up an algorithm you can
point to in the beginning, then readers can read into the details in
the remainder. This way, the reader will be prepared mentally to parse
the text, since they have an image of the process in mind.

3.2.2: Now that we've assigned galaxies to bins, we can compare the
summary statistics across groups (which is the overall goal of the
paper).

3.2.3, P1: It seems like the first two sentences should be swapped,
since because the assumption of normality is violated, we resort to
the bootstrap here.

3.2.3, P2: This shows how to obtain a null distribution and compare
with the observed data. You do a good job laying out the assumptions
and precisely what this means. My only comment is that a reader would
be interested in seeing the results of this test, and a link to the
corresponding table/figure would be helpful.