Writing text in equation

Question

I can correctly write equation containing text, in latex equation editor online. So:

\text{Micro-averaged Precision} = \frac{TP_{total}}{TP_{total} + FP_{total}}

Gives:

In Overleaf, this is displayed somehow not as intended (without space):

With the Undefined control sequence. error.

Answer 1

don't ignore errors, you presumably got an error that \text was not defined, load amsmath package. Also use _{\mathrm{total}} don't use math italic for words