Linear regression - Can I log transform dependent variable and one of the independent ones and keep the rest not transformed? [duplicate]

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I have model where my dependent variable is Total money spend and then I have independent variable Income and some other variables. Is it okay to use log transformation on the dependent variable and one of the independent ones and keep the rest unchanged?

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• A simple example is fitting a power function in a measured predictor $y = ax^b$ with also an indicator variable with values $0$ and $1$. Hence you might work with $\log y = b_1 + b_2 \log x + b_3\ \text{indicator}$, where $b_1= \log a$. Here the indicator does not need transformation and indeed any other transformation could only map $0$ and 1 to two constants, so there is no scope whatever for helpful transformation. – Nick Cox Dec 12 '18 at 15:40