fix double-checking calculation of out-of-sample estimates pipeline #99

[egouldo]

fix #99

[codefactor-io[bot]]

CodeFactor found multiple issues last seen at d14d669781f00ec7f38f17547d1062b089215704:

Put spaces around all infix operators.

• [x] R\back_transformations.R:43
• [x] R\back_transformations.R:62
• [x] R\back_transformations.R:24
• [x] R\back_transformations.R:208
• [x] R\back_transformations.R:100
• [x] R\back_transformations.R:158
• [x] R\back_transformations.R:119
• [x] R\back_transformations.R:178
• [x] R\back_transformations.R:138
• [x] R\back_transformations.R:81

[egouldo]

Note, will need to rebuild package and targets pipeline /document