Cook’s distance is a measure of the effect of deleting an observation on the estimated coefficients. It takes into account both the leverage and the residual of the observation. High Cook’s distance indicates that the observation has a large effect on the estimated coefficients when it’s deleted.
If the Cook’s D is higher than 1.0, or 2x√(k/n), the observation is highly likely to be influential. The Cook’s distance is useful for identifying influential data points as it measure the change in regression estimate if the observation is deleted.
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Welcome to PrepNuggets
Hey visitor,
Are you a CFA Level I candidate, or someone who is exploring taking the CFA exam? Four years ago, I was in your shoes. I am a Computer Engineering graduate and have been working as an engineer all my life. Having developed a keen interest in finance, I decided on a career switch to the finance field and enrolled into the CFA program at the same time.
Was it tough? You bet!
Adjusting to the drastic career change was tough. I naturally neglected the preparation for my Level I exam in June 2014. It was not until the middle of March 2014 that I realized I only had a little more than 2 months to the exam. To compound my problems, I basically did not have a preparation strategy. Having no background in finance at all, I tried very hard to read the curriculum from cover to cover, but eventually that fell flat. I can still recall the number of times I dozed off while studying, or just going back and forth trying to understand even the simplest concept. My mind simply could not keep up after a hard day at work.
Does all these sound familiar to you? Well, take heart. No matter how bleak it seems, at least sit for the exam and treat it as a learning experience. That was basically my attitude as I burrowed through my exam prep with toil and stress. By God’s grace, I did pass my Level I exam in June 2014. It was an experience I would not want to revisit though.
Tweaking the approach
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About the Author
PrepNuggets
Keith is the founder and chief instructor of PrepNuggets. He has a wide range of interests in all things related to tech, from web development to e-learning, gadgets to apps. Keith loves exploring different cultures and the untouched gems around the world. He currently lives in Singapore but frequently travels to share his knowledge and expertise with others.
