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Math Help - Query re Residual Calculation

  1. #1
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    Query re Residual Calculation

    Hi all!

    I have obtained the following model:

    y = 62.3651 + 0.662697x

    The y variable represents the cholesterol level after 4 days whilst the x variable represents the cholesterol level after 2 days.

    The blood cholesterol level 2 days after having a heart attack was 142 mg/dl. And four days after having a heart attack it was 116 mg/dl. I've been asked to use the above model in order to calculate the residual for this patient.

    Below are my workings:

    In order to bring out an estimate for the blood cholesterol level after 4 days I did the following:

    62.3651 + 0.662697(142) = 156.47

    Now the cholesterol level after 4 days was 116 so the residual is 156.47 - 116 = 40.47 mg/dl

    Is my reasoning and working correct?

    Thanks
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by tigerdivision View Post
    Hi all!

    I have obtained the following model:

    y = 62.3651 + 0.662697x

    The y variable represents the cholesterol level after 4 days whilst the x variable represents the cholesterol level after 2 days.

    The blood cholesterol level 2 days after having a heart attack was 142 mg/dl. And four days after having a heart attack it was 116 mg/dl. I've been asked to use the above model in order to calculate the residual for this patient.

    Below are my workings:

    In order to bring out an estimate for the blood cholesterol level after 4 days I did the following:

    62.3651 + 0.662697(142) = 156.47

    Now the cholesterol level after 4 days was 116 so the residual is 156.47 - 116 = 40.47 mg/dl

    Is my reasoning and working correct?

    Thanks
    I would have used 116 - 156.47 = -40.47 as the residual.

    RonL
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  3. #3
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    Thanks RonL!
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