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Based on published data, we have assembled a sample of 88 radio stars forwhich there are both trigonometric parallax and proper motion measurements inthe Gaia DR2 catalogue and VLBI measurements. A new estimate of the systematicoffset between the optical and radio frames has been obtained by analyzing theGaiaDR2-VLBI trigonometric parallax differences: $\Delta\pi=-0.038\pm0.046$ mas(with a dispersion of 0.156 mas). This means that the Gaia DR2 parallaxesshould be increased by this correction. The parallax scale factor is shown tobe always very close to unity within $\sim$3 kpc of the Sun: $b=1.002\pm0.007.$Our analysis of the proper motion differences for the radio stars based on themodel of solid-body mutual rotation has revealed no rotation componentsdiffering significantly from zero:$(\omega_x,\omega_y,\omega_z)=(-0.14,0.03,-0.33)\pm(0.15,0.22,0.16)$ masyr$^{-1}.$

Parameters of the Link between the Optical and Radio Frames from Gaia DR2 Data and VLBI Measurements