"acceptable variation" is correct and can be used in written English.
For example, you could use the phrase "acceptable variation" to describe a set of products which have common features but come in different styles and sizes: "The company offers an acceptable variation of products, ranging from small desks to large tables."
Here, the emphasis, especially where there is a lack of robust evidence to inform practice, has to be on taking sufficient measures to ensure comparability of accepted good practice for the intervention groups, yet allowing for acceptable variation.
Functionality assessment tests verified that the string feeding end-effector could feed 6 m length of string with acceptable variation.
The bibimbap, here a mix of rice, salmon, soft chopped lettuce and pesto, was an acceptable variation on the classic Korean dish.
A milled titanium bar retaining individual all-ceramic zirconium oxide crowns, with composite resin replicating gingival tissues, is recommended as an acceptable variation for this type of prosthesis.
The specification of and justification for design parameter (DP) tolerances are primarily based on the acceptable variation of the functions' performance and the functions' sensitivity to the design parameters.
The numerical results showed that the representative elementary volume (REV) for strength and deformation modulus is 12 m with an acceptable variation of 10%, and the complete stress strain curves of models greater than REV size were very similar to each other.
The following are all acceptable variations of the Harvard SEAS shield.
Acceptable variations include multiple villains and some level of love interest.
The two also stressed statistical approaches to quality, including process control charts that set limits to acceptable variations in key variables affecting a product's production.
A smaller process window of membrane thickness has tighter acceptable variations of membrane thickness, and the suitable process window size is demanded in mass production.
A contract specifies acceptable variations on the availability of these properties and how service replacement can be negotiated to keep the QoS of the application within the acceptable limits.
