+### Testing effectiveness
+
+A question about testing is whether more detected cases is a result of more tests being done or is because the number of cases is increasing. One way of telling the differeence is by looking at the fraction of tests that are positive.
+
+![Positive tests and cases](tests_and_cases.png)
+
+Numbers of positive tests and cases, 7-day moving average.
+Note the different y-axes
+
+![Fraction of tests with positive result](fraction_positive_tests.png)
+
+Fraction of tests with a positive result, both daily figures and 7-day moving average.
+
+
+![Tests against fraction positive, trajectory](fraction_positive_tests_vs_tests.png)
+
+The trajectory of tests done vs fraction positive tests.
+
+Points higher indicate more tests; points to the right indicate more positive tests.More tests being done with the same infection prevelance will move the point up and to the left.