Very recently the modified form of Srivastava-Gupta operators was studied in order to preserve the linear functions. Here, we estimate the rate of approximation for functions having bounded derivatives of the modified form.

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Motivated by recent investigations, in this paper we introduce (p, q)-Szász-beta-Stancu operators and investigate their local approximation properties in terms of modulus of continuity. We also obtain a weighted approximation and Voronovskaya-type asymptotic formula.

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In the present paper, we extend our study for modified Baskakov operators defined by Gupta-Srivastava [5]. We introduce modified Baskakov-Stancu type operators and give the moments in terms of hypergeometric series functions. Further, we establish asymptotic formula and error estimation in simultaneous approximation for these operators.