"of which" on relative pronoun

Question

can anybody tell me when should we use "of which" on relative pronoun? give me some example too if you don't mind..

Mister Micawber · Accepted Answer

Here are 20 or so from COCA:

...contains multiple full color views of the prompt shape, one of which is large (6.5. x 4.75.) and is called the main view.
...resulting from this simple tree, while Figure 11b provides a visualization of which pixels sort into which leaves of the tree
...This study suggests several directions for further work, some of which we have already begun to investigate. One question is the perceptual effectiveness of sparse
...to instigate pollen counts and send reports to the media, as a result of which the pollen count is still included in weather forecasts today..
...to start to change towards healthier eating and an improved lifestyle, the benefits of which extend to the whole family, as well as healthier future pregnancies. .
...blood pressure, and diets high in fat impact on cholesterol levels, both of which are known to increase stroke risk. The impact of poor diet over a number
...reviewing nearly 50,000 patients found a 38% reduction in all strokes, the effects of which applied to both blacks and whites..
...wide choice of therapies at her disposal to manage type 2 diabetes, many of which have advantages over insulin both for lifestyle, metabolism and - at times - employment
...There are many other therapies to choose from, many of which can be used before moving to insulin and some of which have advantages over it
...from, many of which can be used before moving to insulin and some of which have advantages over it. However insulin is now commonly started in general practice and
... causes of amenorrhea are weight loss, fitness training and distance running, all of which can affect the hormone cycle, causing temporary ovarian shutdown, cessation of periods and
...observes the industry from either an empowerment or an oppression paradigm model, both of which have an element of advocacy. My research approach was to try to be as
... the Internet could make its way onto a wider range of instruments, all of which will offer viewers far sharper images, a much quicker connection, and a more
...allowing investigation of the relationships among the true (latent) variables, of which the measured study variables are only imperfect surface manifestations. For example, utterance complexity
... family care-givers' differential use of communication strategies during completion of ADLs, some of which are consistent with the current empirical research and inconsistent with the current clinical recommendations
...Caregivers produced a combined total of 1,691 utterances, of which 78% contained one or more communication strategies
...(1997) and Small et al. (2003), both of which suggest that caregivers consider both types of repetition to facilitate comprehension in individuals with AD
...are important stakeholders in this research area, and as such, their perceptions of which communication strategies are effective when assisting residents with moderate to severe AD should be addressed
...InVEST can take existing data on various ecosystem services -- each of which may fall under a different field of study -- and provide one consistent platform for
...insects, and bacteria. Populations of ecologically dominant marine organisms, most of which are either invertebrates or microbes, are just as poorly understood.
...The new tools come from a wide range of disciplines -- some of which fall outside the usual domain of environmental health -- and they are already helping researchers

"of which" on relative pronoun

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