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We study the scaling of the magnetic susceptibility in the square Ising modelbased upon the delta-expansion in the high temperature phase. Thesusceptibility chi is expressed in terms of the mass M and expanded in powersof 1/M. The dilation around M=0 by the delta expansion and the parametricextension of the ratio of derivatives of chi, chi^{(ell+1)}/chi^{(ell)} is usedas a test function for the estimation of the critical exponent gamma with nobias from information of the critical temperature. Estimation is done with thehelp of the principle of minimum sensitivity and detailed analysis revealedthat ell=0,1 cases provide us accurate estimation results. Critical exponent ofthe sub-leading scaling term is also estimated.

Notes on the delta-expansion approach to the 2D Ising susceptibility scaling