Attrition Calculation in IT Companies - How is monthly/quarterly/yearly attrition projected?

Shikha Satyendra Prasad
Hi All, I am working in an IT services company. I want to know a few things about attrition in other IT companies:

Current Market Trend.
How is attrition calculated. What is the formula used.
How is monthly/quarterly/yearly attrition projected?

Pls help with ur inputs as I am doing some market survey on this.
Shikha Satyendra Prasad
Hi All, Looking forward to your responses on the above questions.
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