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Practical explanations, career decisions and reproducible workflows. Read the reasoning, inspect the evidence and follow the next skill into a real programme.
How to ask a doubt your mentor can answer in one reply
A doubt gets answered in one reply when it contains five things: what you were trying to do, the smallest code or formula that shows the problem, the exact error or wrong output, what you expected, and what you already…
How employers treat online course certificates at each hiring stage
Employers treat an online course certificate as a small, early signal. It can help a recruiter decide your resume is relevant, it's a talking point for a hiring manager, and it can come up in document checks. Once you…
Hotel management to data analyst: occupancy, ADR and RevPAR
For a hotel management graduate or front-office professional, the most direct route into data analysis is rebuilding the numbers the night audit already prints — occupancy, ADR and RevPAR — from raw booking rows in SQL…
Hospital bed occupancy and ALOS from an admissions register
Bed occupancy rate (BOR) is inpatient days divided by available bed-days, and average length of stay (ALOS) is the inpatient days of discharged patients divided by the number of discharges. Both come straight from an…
Separate holiday and weekday effects in daily sales data
To measure how much weekdays and public holidays move daily sales, fit one linear regression on log daily sales, with a dummy variable for each weekday except a base day, a dummy for holidays, a dummy for the day before…
Healthcare data analyst role: hospitals, insurers and careful metrics
A healthcare data analyst turns data from hospital information systems, insurance claims or health-tech platforms into measures that managers and clinicians use: bed occupancy, length of stay, readmissions, claim…
Health insurance cashless TAT: measure the clocks IRDAI sets
Cashless turnaround time (TAT) is the elapsed time between a hospital's request and the insurer's or TPA's decision, measured separately for pre-authorisation and for final discharge authorisation. IRDAI's health FAQ…
Haryana's interstate goods flows from e-way bill statistics
Haryana generated about 8.24 crore outgoing interstate e-way bills in 2024-25 but received only about 3.75 crore incoming ones, yet the rupee value moving in each direction was similar. So Haryana sends out many smaller…
Hackathons and Kaggle for freshers: what they prove, how to show it
Kaggle competitions and hackathons each prove something real but narrow. A good Kaggle result shows you can build, validate and iterate on a model when the problem, data and metric are handed to you; a hackathon shows…
Guesstimate interview practice with a Noida metro UPI example
A guesstimate question asks you to estimate a number you cannot look up — here, how many UPI payments happen in a day around one Noida metro station — and it is scored on method, not on hitting a "right" number. The…
Reconcile GSTR-2B with your purchase register in pandas
To reconcile GSTR-2B with a purchase register, normalise both files into the same columns, build a key from supplier GSTIN plus a cleaned invoice number, and do an outer join. Every row then lands in one of four…
Validate GSTIN and PAN formats, including the GSTIN check digit
A GSTIN is 15 characters: a two-digit state code, the holder's ten-character PAN, a two-character entity code and a final check character. To validate a column of them, upper-case and trim each value, confirm the state…
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