The phrase "a relatively simple formula" is correct and usable in written English.
You can use it when describing a formula that is not overly complex and can be easily understood or applied.
Example: "In this study, we will use a relatively simple formula to calculate the area of the circle."
Alternatives: "a fairly straightforward formula" or "an uncomplicated formula".
"It's actually a relatively simple formula," Ms. Begoun said.
4. Most story plots, including many of Shakespeare's, follow a relatively simple formula.
The fact that pi can be produced by a relatively simple formula means that pi is orderly.
Decades ago, banks determined bonuses according to a relatively simple formula that took into account an employee's seniority and performance.
As Ehrman puts it, "a relatively simple formula" undergirds Paul's salvationism: "sin leads to punishment; Christ took the punishment upon himself; therefore, Christ's death can atone for the sins of others".
The Doylestown images, which are the heart of this exhibition, form a series similar to those by Mr. Kelly or the young Frank Stella in that they show an artist methodically circling an idea, extracting an unexpected richness from what seems to be a relatively simple formula.
For the SAR(1) model, the entries of the inverse matrix (Sigma _{ZZ}^{-1}) have known, relatively simple formulas, see Wise (1955) and Zinde-Walsh (1988).
One group, the empirical models (e.g. One Slope Model [4]), utilises relatively simple formulas containing empirical parameters to estimate path-loss and therefore do not require a database of exact positions of obstacles.
Relatively simple formulas for the evaluation of the friction coefficient, based on appopriate models of the lubricant behaviour, have been developed that provide results in quite good agreement with the experimental ones under fluid-film conditions when thermal effects can be neglected.
The camera is a relatively simple device.
It's a relatively simple plan.
