I appreciate the question, spongy0llama. Both answers thus far are wise and offer much of consideration - Greensleeves Hubs & Tom Vogler.
I do not have the answer, yet of an answer in the form of questions and experience seeking the same with observations.
Not being critical, only offering a proposal is to use the formula of cognitive thinking as being critical first, then follow through with behaviors related to articles and those markets of specificity.
One may discover more with cause with a telescope rather than effect with a microscope. The middle man of business is where the answer regarding values and worth come in to play with affect. Affect is too an effect following cause, which is a product of inspiration. Steps 1 - 2 - 3 repeats itself from here to there always until ending.
Whether a graphing software is used or a crayola is not of significance. It is those waves surfed of consequence. What is the amplitude and the frequency of the whole, the parts (especially if grouping is utilized leading the interested reader with a hop - skip - and a jump of likeness and not difference.), and the specific of the individual hub.
Sharing a bit. This year those amplitudes and frequencies of this authors portfolio is not as consistent as the year last. Cause is posting hubs without a plan being random. Google Analytics indicates flow is more haphazard than directed while considering who the author of flow and direction is.
Once that amplitude is measured relative to the frequency consider cause of frequency or when the addition of is added to and the what being a group or the part of the whole being the profile.
Questions of marketing considerations are does one add seeking random or specific?
Does trend meaning a trend relative to a specific portfolio independent and autonomous of the the 'at large' community of portfolio predict or lead to a niche, which is unique.
Example: At the portfolio of tsmog are six elements being marketed. Two are books, of which completeness is a query at this time of the author seeking both endings. Four more are specific groupings - How to Discover the Writer's Voice, Offering Hope Through Prayer, Prose - Poetry - Essay - The Combining Form, and social commentary.
There are multiple levels of marketing and this is a best guess in a presumed order. Followers, HubPages communities via specifics of category selections, hubpages at large via search engine, then indexing at Google with their system of prioritizing.