"deduction about" is correct and usable in written English.
It is commonly used in sentences to express a logical conclusion based on evidence or reasoning. For example: "Based on the evidence presented, we can make a deduction about the suspect's whereabouts at the time of the crime."
The largest subsidy in the federal system is the mortgage interest deduction, about $100 billion annually.
Did they reach some tragic deduction about life that the rest of us are too dim to see?
Facebook makes a deduction about your political views based on the pages that you like — or on your political preference, if you stated one, on your profile page.
If the deduction about Comcast buying PowerCloud turns out to be accurate, it is not clear how Comcast may end up implementing PowerCloud Systems, but there are a couple of obvious places where it could make sense.
However, the new amount allowed for deduction — about $47,000 over five years, up from about $15,000 — now makes buying a luxury car much more attractive.
The Realtors' study found that more than 5 million in California claim the mortgage interest deduction, about 10 times the number of wealthy filers doing so.
Eliminating all but the mortgage interest and charitable contribution breaks would have reduced itemized deductions by about $120 billion.
Grain size analysis provides a useful tool in reconstructing aeolian transport processes and allows deductions about environmental evolution.
He's a little scary as he begins to make shrewd, accurate deductions about the past.
But it can also be a wonderful thing to make humble deductions about what the winner did right.
Assignment of chemical structures to the main molecular ions has allowed deductions about the chemical processes underlying radiation induced change to be made.
