Calculation of atmospheric neutrino fluxes

The atmospheric neutrino fluxes at the Kamioka site are calculated semianalytically. We investigate the dependence of various physical parameters on the resultant fluxes. Both the absolute value of the fluxes and the (${\nu }_{\mathit{e}}$+ν${\mathrm{¯}}_{\mathit{e}}$)/(${\nu }_{\mathrm{\mu }}$+ν${\mathrm{¯}}_{\mathrm{\mu }}$) ratio agree with those of the previous calculation. In particular, it is found that the (${\nu }_{\mathit{e}}$+ν${\mathrm{¯}}_{\mathit{e}}$)/(${\nu }_{\mathrm{\mu }}$+ν${\mathrm{¯}}_{\mathrm{\mu }}$) ratio is almost independent of the method or the details of calculation.