| タイトル | On the appropriateness of applying chi-square distribution based confidence intervals to spectral estimates of helicopter flyover data |
| 本文（外部サイト） | http://hdl.handle.net/2060/19890001230 |
| 著者（英） | Rutledge, Charles K. |
| 著者所属（英） | Planning Research Corp. |
| 発行日 | 1988-08-01 |
| 言語 | eng |
| 内容記述 | The validity of applying chi-square based confidence intervals to far-field acoustic flyover spectral estimates was investigated. Simulated data, using a Kendall series and experimental acoustic data from the NASA/McDonnell Douglas 500E acoustics test, were analyzed. Statistical significance tests to determine the equality of distributions of the simulated and experimental data relative to theoretical chi-square distributions were performed. Bias and uncertainty errors associated with the spectral estimates were easily identified from the data sets. A model relating the uncertainty and bias errors to the estimates resulted, which aided in determining the appropriateness of the chi-square distribution based confidence intervals. Such confidence intervals were appropriate for nontonally associated frequencies of the experimental data but were inappropriate for tonally associated estimate distributions. The appropriateness at the tonally associated frequencies was indicated by the presence of bias error and noncomformity of the distributions to the theoretical chi-square distribution. A technique for determining appropriate confidence intervals at the tonally associated frequencies was suggested. |
| NASA分類 | ACOUSTICS |
| レポートNO | 89N10601
NAS 1.26:181692
NASA-CR-181692 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/145128 |
