nipals with MCA

[HedvigS]

I work with binary data a lot and I like the nipals approach. Would you be open to adaptions of pcaMethods::nipalsPca to do MCA instead of PCA?

I had a look at the code, and I think it's fairly achievable (possibly famous last words...). I could try giving it a go and submit a PR?

[hredestig]

Sure, welcome to! But I warn that since this package is old, and I don't much bandwidth to maintain it, I don't want to give any promises on how fast I'd be able to release new version after included - just to manage expectations. The package doesn't have any tests but please do include testthat code so we can keep track of how we verify that the implementation works as expected.