Butz et al. evaluated the duration of benefit derived from the use of noninvasive positive-pressure ventilation by patients with amyotrophic lateral sclerosis (ALS) on symptoms, quality of life and survival. ALS, aka Lou Gehrig's Disease, is a degenerative disease of the motor neurons. One of the variables of interest is partial pressure of arterial carbon dioxide (PaCO2). The values below (measured in mm Hg) reflect the results of baseline testing on 20 of the 30 subjects in the study, as established by arterial blood gas analyses. (Am. J Med. Rehab. 2003, 82:597-604) 40 47 34 42 54 48 54 57 58 45 54 54 43 44 63 42 33 43 52 38 Find the skewness and kurtosis using Excel or Matlab. And Determine if the data are too skewed or too leptokurtic or platykurtic. Also, Determine the coefficient of variation.
Butz et al. evaluated the duration of benefit derived from the use of noninvasive positive-pressure
ventilation by patients with amyotrophic lateral sclerosis (ALS) on symptoms, quality of life and
survival. ALS, aka Lou Gehrig's Disease, is a degenerative disease of the motor neurons. One of the
variables of interest is partial pressure of arterial carbon dioxide (PaCO2). The values below (measured
in mm Hg) reflect the results of baseline testing on 20 of the 30 subjects in the study, as established by
arterial blood gas analyses. (Am. J Med. Rehab. 2003, 82:597-604)
40 47 34 42 54 48 54 57 58 45
54 54 43 44 63 42 33 43 52 38
Find the skewness and kurtosis using Excel or Matlab. And Determine if the data are too skewed or too leptokurtic or platykurtic. Also, Determine the coefficient of variation.
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