# What test if one group is only yes

I have the following data set:
Patient Disease1 Disease2
1 Yes Yes
2 No Yes
3 Yes Yes
...
270 No Yes
271 Yes Yes

Obs: all patients of disease 2 have yes
What kind of test I can do to verify if disease 2 is related to disease 1 and statistically significant whe I have only "Yes" for disease 2 ?

f(x) = y

x the data frame of observations of `Disease1` and `Disease2`

y the probability of observing `Disease2`

f the function that predicts `Disease2` based on `Disease`

In statistical notation P(Disease2|Disease1), the probability of Disease2 given Disease1 is the same as P(Disease1=Yes) and P(Disease1=No) for all occurrences of `Disease2` in x. Nothing about `Disease1` makes `Disease2` either more or less probable, given the assumption that the distribution of Disease2 in the population is the same as the distribution of Disease2 in the observations.

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