Warning: Undefined variable $zfal in C:\Inetpub\vhosts\kidney.de\httpdocs\mlpefetch.php on line 525
Deprecated: str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in C:\Inetpub\vhosts\kidney.de\httpdocs\mlpefetch.php on line 525
Warning: Undefined variable $sterm in C:\Inetpub\vhosts\kidney.de\httpdocs\mlpefetch.php on line 530
Warning: Undefined variable $sterm in C:\Inetpub\vhosts\kidney.de\httpdocs\mlpefetch.php on line 531
English Wikipedia
Nephropedia Template TP (
Twit Text
DeepDyve Pubget Overpricing |
lüll Methods for analysis of skewed data distributions in psychiatric clinical studies: working with many zero values Delucchi KL; Bostrom AAm J Psychiatry 2004[Jul]; 161 (7): 1159-68OBJECTIVE: Psychiatric clinical studies, including those in drug abuse research, often provide data that are challenging to analyze and use for hypothesis testing because they are heavily skewed and marked by an abundance of zero values. The authors consider methods of analyzing data with those characteristics. METHOD: The possible meaning of zero values and the statistical methods that are appropriate for analyzing data with many zero values in both cross-sectional and longitudinal designs are reviewed. The authors illustrate the application of these alternative methods using sample data collected with the Addiction Severity Index. RESULTS: Data that include many zeros, if the zero value is considered the lowest value on a scale that measures severity, may be analyzed with several methods other than standard parametric tests. If zero values are considered an indication of a case without a problem, for which a measure of severity is not meaningful, analyses should include separate statistical models for the zero values and for the nonzero values. Tests linking the separate models are available. CONCLUSIONS: Standard methods, such as t tests and analyses of variance, may be poor choices for data that have unique features. The use of proper statistical methods leads to more meaningful study results and conclusions.|*Statistics as Topic[MESH]|Cross-Sectional Studies[MESH]|Data Interpretation, Statistical[MESH]|Humans[MESH]|Longitudinal Studies[MESH]|Models, Statistical[MESH]|Psychiatric Status Rating Scales/statistics & numerical data[MESH]|Psychiatry/methods/*statistics & numerical data[MESH]|Research Design[MESH]|Severity of Illness Index[MESH]|Statistics, Nonparametric[MESH]|Substance-Related Disorders/diagnosis[MESH] |