Im calculating the recovery rate of cultures before and after freeze drying by dividing the after freeze drying counts with before freezing counts and multiplying with 100. Im working in excel and it does not present counts in standard notation e.g. 3.1 x10^9 will be displayed as 3100000000. I then covert the counts to log and find it easier to calculate percentage survival using smaller log values. My dilemma is when using the actual values I get very small values for the survival percentage as the after counts are always smaller than before counts.
Do not convert actual number to log, you will get wrong results because the converted number will be a new number and a new number will give a new percentage. this is happening because log is not a linear in nature. if you use a linear conversion factor you will get correct result.
That sounds good Yogesh Kumar because the percentages I get with log counts against actual counts are too far apart. However I don't seem to get Yogesh Kumar when he says I use a linear conversion factor. Can you give work out an example withy this counts: 1100000000 before, and 1040000000 after. The formula is Survival rate= after/before*100
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