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| | #REDIRECT [[Template:WebNotes/ALTAALTA_Standard_Folio_Data_TempHumidity]] |
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| | align="center" valign="middle" |{{Font|Standard Folio Data TH-Lognormal|11|tahoma|bold|gray}}
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| The <math>pdf</math> of the lognormal distribution is given by:
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| <math>f(T)=\frac{1}{T\text{ }{{\sigma }_{{{T}'}}}\sqrt{2\pi }}{{e}^{-\tfrac{1}{2}{{\left( \tfrac{{T}'-\overline{{{T}'}}}{{{\sigma }_{{{T}'}}}} \right)}^{2}}}}</math>
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| where:
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| <math>{T}'=\ln (T)</math>
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| <math>T=\text{times-to-failure}</math>
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| and:
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| • <math>\overline{{{T}'}}=</math> mean of the natural logarithms of the times-to-failure.
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| • <math>{{\sigma }_{{{T}'}}}=</math> standard deviation of the natural logarithms of the times-to-failure.
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| | align="center" valign="middle" | [http://reliawiki.com/index.php/Template:T-h_lognormal T-H Lognormal]
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