Calculate percentile of value in column

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I have a dataframe with a column that has numerical values. This column is not well-approximated by a normal distribution. Given another numerical value, not in this column, how can I calculate its percentile in the column? That is, if the value is greater than 80% of the values in the column but less than the other 20%, it would be in the 20th percentile.

Sort the column, and see if the value is in the first 20% or whatever percentile.

for example:

def in_percentile(my_series, val, perc=0.2): 
    myList=sorted(my_series.values.tolist())
    l=len(myList)
    return val>myList[int(l*perc)]

Or, if you want the actual percentile simply use searchsorted:

my_series.values.searchsorted(val)/len(my_series)*100

[PDF] Calculating Percentiles, Percentiles are very handy for exploring the distribution of number sets using various. EDA graphs To calculate percentiles, sort the data so that x1 is the smallest value, and xn is the largest, (filling in the final row, we get) xi. 1. 3. 5. 7. 9. 9. PERCENTILE formula in excel is used for calculating the specific percentile value of the selected array. It returns the Kth value. Percentile formula in excel can be used to find what percentage of values are falling under Kth percentile value. PERCENTILE function can only be used in Microsoft Excel version 2007 and earlier versions of it. As it is compatible for those versions only.

To find the percentile of a value relative to an array (or in your case a dataframe column), use the scipy function stats.percentileofscore().

For example, if we have a value x (the other numerical value not in the dataframe), and a reference array, arr (the column from the dataframe), we can find the percentile of x by:

from scipy import stats
percentile = stats.percentileofscore(arr, x)

Note that there is a third parameter to the stats.percentileofscore() function that has a significant impact on the resulting value of the percentile, viz. kind. You can choose from rank, weak, strict, and mean. See the docs for more information.

For an example of the difference:

>>> df
   a
0  1
1  2
2  3
3  4
4  5

>>> stats.percentileofscore(df['a'], 4, kind='rank')
80.0

>>> stats.percentileofscore(df['a'], 4, kind='weak')
80.0

>>> stats.percentileofscore(df['a'], 4, kind='strict')
60.0

>>> stats.percentileofscore(df['a'], 4, kind='mean')
70.0

As a final note, if you have a value that is greater than 80% of the other values in the column, it would be in the 80th percentile (see the example above for how the kind method affects this final score somewhat) not the 20th percentile. See this Wikipedia article for more information.

Excel formula: Percentile IF in table, To calculate a conditional percentile, you can use an array formula using the IF a small summary table with percentile values in column F and gender values in� A percentile which is calculated with 0.4 as n means 40% of the values are either less than or equal to the result which is calculated. Similarly, a percentile calculated with 0.9 means 90%. To use the PERCENTILE Function without any error, you should provide a range of values and a number between 0 and 1 for the “n” argument.

Since you're looking for values over/under a specific threshold, you could consider using pandas qcut function. If you wanted values under 20% and over 80%, divide your data into 5 equal sized partitions. Each partition would represent a 20% "chunk" of equal size (five 20% partitions is 100%). So, given a DataFrame with 1 column 'a' which represents the column you have data for:

df['newcol'] = pd.qcut(df['a'], 5, labels=False)

This will give you a new column to your DataFrame with each row having a value in (0, 1, 2, 3, 4). Where 0 represents your lowest 20% and 4 represents your highest 20% which is the 80% percentile.

Calculate Percentile and Conditional Ranking in Excel Using , Learn how to dynamically calculate conditional percentiles and rank with of calculating percentiles and ranking values based on filtering criteria using a In the window that appears, choose the column that contains the criteria to sort by. The above screenshot is of Excel sheet where I percentrank.exc function to calculate percentile and the values that I got were between 0.1to 1.0 then I converted these number to percentages Message 3 of 10

Probably very late but still

df['column_name'].describe()

will give you the regular 25, 50 and 75 percentile with some additional data but if you specifically want percentiles for some specific values then

df['column_name'].describe(percentiles=[0.1, 0.2, 0.3, 0.5])

This will give you 10th, 20th, 30th and 50th percentiles. You can give as many values as you want.

How to Use Excel to Find Percentiles, Click on cell "A1" and enter the values in your data set into the cells in column A. The percentile value must be between zero and one, so if you wanted to find� This formula sits inside a small summary table with percentile values in column F and gender values in G4 and H4. Working from the inside out, the IF function is set up like this: IF (Table [Gender]=G$4,Table [Score]) Here, each value in the gender column is tested against the value in G4, “Male”.

Percentile rank of a column in pandas python, Percentile rank of a column in pandas python is carried out using rank() function with argument (pct=True) .Let's see With an example to get percentile value. Returns a data frame with new columns for each percentile level. New columns are given names like percentile.95 e.g. when percentile = 95 is chosen.

Calculate SQL Percentile using the PERCENT_RANK function in , The PERCENT_RANK function in SQL Server calculates the relative rank SQL Percentile of each row. It always returns values greater than 0,� A percentile is a value below which a given percentage of values in a data set fall. A percentile calculated with .4 as k means 40% percent of values are less than or equal to the calculated result, a percentile calculated with k = .9 means 90% percent of values are less than or equal to the calculated result. To use PERCENTILE, provide a range of values and a number between 0 and 1 for the "k" argument, which represents percent.

Percentile function - Minitab, For example, in the following graph, 25% of the total data values lie below the 25th For example, to determine the 1st quartile (25th percentile) of a column of � Percentile function is used for calculating the nth percentile of any set of values below which given percentage of observations of the selected set of values falls. Suppose, we have 10 numbers, for which we calculate percentile at 5 th value, then we will get the percentile below selected Kth value.

Comments
  • Hey, it would be very useful to change the accepted answer to the most upvoted one, since it is much more complete and features a more or less standardized method of calculating the percentile of a new value.
  • This way I have to iterate over all possible percentiles to find out which percentile the new value is in.